Quarterly report pursuant to Section 13 or 15(d)

Stock Warrants - Schedule of Warrants Outstanding (Detail)

Stock Warrants - Schedule of Warrants Outstanding (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Jun. 12, 2015	Jun. 11, 2015	Aug. 01, 2014
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	27,336,507	13,503,107
Weighted-average exercise price per share	$ 3.97	$ 5.02
Placement Agent Warrants [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	189,126	189,126
Class A Warrants [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	6,880,333	6,880,333
Representative's Warrant [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	$ 7.50
Shares Underlying Outstanding Warrants	206,410	206,410
Other Warrants [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	380,694	547,294
Exercise Price Less Than or Equal to $3.00 [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	17,407,304
Expiration Start Date	Dec. 12, 2016
Expiration End Date	Sep. 01, 2021
Exercise Price $4.01 - $4.99 [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	7,069,459
Expiration Start Date	Feb. 01, 2017
Expiration End Date	Jun. 11, 2020
Exercise Price $5.00 - $9.99 [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	2,656,900
Expiration Start Date	Dec. 10, 2016
Expiration End Date	Jun. 27, 2021
Exercise Price Greater Than or Equal to $10.00 [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	101,742
Expiration Start Date	Aug. 31, 2016
Expiration End Date	Jan. 05, 2022
Exercise Price $3.01 - $3.99 [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	101,102
Expiration Start Date	Sep. 08, 2019
Expiration End Date	Apr. 19, 2020
Minimum [Member] \| Exercise Price $4.01 - $4.99 [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	$ 4.01
Minimum [Member] \| Exercise Price $5.00 - $9.99 [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	5.00
Minimum [Member] \| Exercise Price Greater Than or Equal to $10.00 [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	10.00
Minimum [Member] \| Exercise Price $3.01 - $3.99 [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	3.01
Maximum [Member] \| Exercise Price Less Than or Equal to $3.00 [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	3.00
Maximum [Member] \| Exercise Price $4.01 - $4.99 [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	4.99
Maximum [Member] \| Exercise Price $5.00 - $9.99 [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	9.99
Maximum [Member] \| Exercise Price $3.01 - $3.99 [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	$ 3.99
Note Warrants [Member]
Class of Warrant or Right [Line Items]
Exercise Prices					$ 3.00
Shares Underlying Outstanding Warrants	3,315,878	3,315,878
Private Placement [Member]
Class of Warrant or Right [Line Items]
Exercise Prices	$ 4.65		$ 8.00	$ 8.00
Warrants [Member] \| Private Placement [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	2,364,066	2,364,066
CMPO Warrants [Member]
Class of Warrant or Right [Line Items]
Shares Underlying Outstanding Warrants	14,000,000