Capital Structure - Additional Information (Detail) - USD ($)
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1 Months Ended |
3 Months Ended |
6 Months Ended |
9 Months Ended |
13 Months Ended |
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Sep. 30, 2018 |
Aug. 03, 2018 |
Jul. 25, 2017 |
Jul. 27, 2016 |
Nov. 02, 2015 |
Jun. 12, 2015 |
Aug. 01, 2014 |
Aug. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Jun. 30, 2014 |
Dec. 31, 2017 |
Class of Stock [Line Items] |
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Common stock, shares authorized |
200,000,000
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200,000,000
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200,000,000
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200,000,000
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Common stock, par value |
$ 0.0001
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$ 0.0001
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$ 0.0001
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$ 0.0001
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Issuance costs allocated to warrants |
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$ 0
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$ 905,014
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Net proceeds from initial public offering |
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$ 35,000,000
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Initial public offering, closing date |
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Aug. 01, 2014
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Initial public offering, units description |
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In August 2014, the Company completed an initial public offering (“IPO”), raising net proceeds of $35.0 million after underwriting discounts, commissions and offering expenses payable by us, through the issuance and sale of our units, which consisted of one share of common stock, one Class A Warrant to purchase one share of common stock at an exercise price of $4.80 per share and one Class B Warrant to purchase one-half share of common stock at an exercise price of $4.00 per full share (“Units”).
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Proceeds from exercise of warrants |
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$ 5,503
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Number of warrants or rights outstanding |
31,265,182
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31,265,182
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31,265,182
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36,270,103
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Common stock, voting rights |
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The holders of shares of common stock are entitled to one vote for each share of common stock held at all meetings of stockholders and written actions in lieu of meetings.
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Dividends declared or paid |
$ 0
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8.00% Convertible Notes due May 31, 2015 [Member] |
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Class of Stock [Line Items] |
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Convertible Notes, principal amount |
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$ 15,000,000
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Convertible Notes, interest rate |
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8.00%
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Convertible Notes, due date |
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May 31, 2015
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2016 Warrants [Member] |
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Class of Stock [Line Items] |
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Number of warrants or rights outstanding |
14,000,000
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14,000,000
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14,000,000
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14,000,000
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2017 Warrants [Member] |
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Class of Stock [Line Items] |
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Number of warrants or rights outstanding |
15,996,450
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15,996,450
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15,996,450
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16,000,000
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Private Placement [Member] |
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Class of Stock [Line Items] |
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Number of shares issued |
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4,728,128
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Aggregate gross sales proceeds from common stock |
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$ 20,000,000
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Net proceeds received |
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$ 18,300,000
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Warrants to purchase shares of common stock |
189,126
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2,364,066
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189,126
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189,126
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Warrant exercise price per share |
$ 4.65
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$ 8.00
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$ 4.65
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$ 4.65
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Warrant expiration term |
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3 years
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Warrant expiration date |
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Jun. 11, 2020
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Initial Public Offering [Member] |
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Class of Stock [Line Items] |
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Conversion of Convertible Notes together with accrued and unpaid interest into common stock, shares |
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5,109,988
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Follow-on Offering [Member] |
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Class of Stock [Line Items] |
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Number of shares issued |
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5,750,000
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32,000,000
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14,000,000
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Aggregate gross sales proceeds from common stock |
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$ 11,500,000
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$ 40,000,000
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$ 35,000,000
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Net proceeds received |
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$ 10,400,000
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$ 37,100,000
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$ 32,000,000
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Warrants to purchase shares of common stock |
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0
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3,550
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Follow-on Offering [Member] | CMPO Warrants [Member] |
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Class of Stock [Line Items] |
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Warrants to purchase shares of common stock |
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16,000,000
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14,000,000
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Follow-on Offering [Member] | 2016 Warrants [Member] |
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Class of Stock [Line Items] |
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Warrant exercise price per share |
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$ 3.00
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Warrant expiration term |
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5 years
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Fair value of warrants |
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$ 18,600,000
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Issuance costs allocated to warrants |
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$ 1,600,000
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Follow-on Offering [Member] | 2017 Warrants [Member] |
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Class of Stock [Line Items] |
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Warrant exercise price per share |
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$ 1.55
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Warrant expiration term |
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5 years
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Fair value of warrants |
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$ 12,400,000
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Issuance costs allocated to warrants |
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$ 900,000
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Note Warrants [Member] |
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Class of Stock [Line Items] |
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Warrant exercise price per share |
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$ 3.00
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Warrant expiration term |
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5 years
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Number of warrants or rights outstanding |
692,858
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3,321,416
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692,858
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692,858
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3,315,878
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Class of warrant or rights, expired |
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413,432
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2,209,588
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Class B Warrants [Member] |
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Class of Stock [Line Items] |
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Warrant expiration date |
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Nov. 02, 2015
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Warrants exercised |
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4,812,328
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Common stock shares issued upon exercise of warrants |
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2,406,164
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Proceeds from exercise of warrants |
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$ 9,600,000
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Class B Warrants [Member] | Initial Public Offering [Member] |
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Class of Stock [Line Items] |
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Warrant exercise price per share |
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$ 4.00
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Representative's Warrant [Member] |
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Class of Stock [Line Items] |
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Warrants to purchase shares of common stock |
206,410
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206,410
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206,410
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Warrant exercise price per share |
$ 7.50
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$ 7.50
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$ 7.50
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Warrant expiration date |
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Jul. 28, 2019
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Class of warrant purchase percentage |
3.00%
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3.00%
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3.00%
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Warrant exercisable period |
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180 days
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Number of warrants or rights outstanding |
206,410
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206,410
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206,410
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206,410
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Class A Warrants [Member] |
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Class of Stock [Line Items] |
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Warrant expiration date |
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Feb. 01, 2017
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Class A Warrants [Member] | Initial Public Offering [Member] |
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Class of Stock [Line Items] |
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Warrant exercise price per share |
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$ 4.80
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