Annual report pursuant to Section 13 and 15(d)

Capital Structure - Additional Information (Detail)

v3.20.1
Capital Structure - Additional Information (Detail) - USD ($)
 12 Months Ended 13 Months Ended
Dec. 18, 2019
Dec. 12, 2019
Aug. 03, 2018
Jul. 25, 2017
Jul. 27, 2016
Jun. 12, 2015
Aug. 01, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2014
Class of Stock [Line Items]                      
Common stock, shares authorized               200,000,000      
Common stock, par value               $ 0.0001 $ 0.0001    
Number of shares issued 2,565,000 3,715,000                  
Net proceeds received $ 10,000,000                    
Gross Proceed   $ 13,000,000                  
Combined Net Proceeds   $ 21,300,000                  
Aggregate gross sales proceeds from common stock               $ 23,034,000 $ 11,500,000 $ 40,000,000  
Issuance costs allocated to warrants                   $ 905,014  
Initial public offering, closing date               Aug. 01, 2014      
Number of warrants or rights outstanding               3,033,910 3,124,304    
Common stock, voting rights               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.      
8.00% Convertible Notes due May 31, 2015 [Member]                      
Class of Stock [Line Items]                      
Convertible Notes, principal amount                     $ 15,000,000
Convertible Notes, interest rate                     8.00%
Convertible Notes, due date                     May 31, 2015
2016 Warrants [Member]                      
Class of Stock [Line Items]                      
Number of warrants or rights outstanding               1,400,000 1,400,000    
2017 Warrants [Member]                      
Class of Stock [Line Items]                      
Number of warrants or rights outstanding               1,599,645 1,599,645    
Private Placement [Member]                      
Class of Stock [Line Items]                      
Number of shares issued           472,812          
Net proceeds received           $ 18,300,000          
Number of Shares Issued   1,111,111                  
Warrants to purchase shares of common stock           236,406   18,903      
Warrant exercise price per share           $ 80.00   $ 46.50      
Private placement, securities description               Each investor received one share of common stock and a warrant to purchase one-half share of common stock at a price of $42.30 per common share purchased.      
Exercise price per common share           $ 42.30          
Class of warrant purchase percentage               4.00%      
Warrant expiration date               Jun. 11, 2020      
Initial Public Offering [Member]                      
Class of Stock [Line Items]                      
Conversion of Convertible Notes together with accrued and unpaid interest into common stock, shares             510,998        
Follow-on Offering [Member]                      
Class of Stock [Line Items]                      
Number of shares issued     575,000 3,200,000 1,400,000            
Net proceeds received     $ 10,400,000 $ 37,100,000 $ 32,000,000            
Warrants to purchase shares of common stock       1,600,000              
Aggregate gross sales proceeds from common stock     $ 11,500,000 $ 40,000,000 $ 35,000,000            
Warrant exercise price per share       $ 15.50 $ 30.00            
Follow-on Offering [Member] | CMPO Warrants [Member]                      
Class of Stock [Line Items]                      
Warrants to purchase shares of common stock       1,600,000 1,400,000            
Follow-on Offering [Member] | 2016 Warrants [Member]                      
Class of Stock [Line Items]                      
Fair value of warrants         $ 18,600,000            
Issuance costs allocated to warrants         $ 1,600,000            
Follow-on Offering [Member] | 2017 Warrants [Member]                      
Class of Stock [Line Items]                      
Warrant expiration term                 5 days    
Fair value of warrants       $ 12,400,000              
Issuance costs allocated to warrants       $ 900,000              
Note Warrants [Member]                      
Class of Stock [Line Items]                      
Warrant exercise price per share             $ 30.00        
Warrant expiration term                 5 days    
Number of warrants or rights outstanding             332,142   67,070 [1]    
Class of warrant or rights, expired               67,070 264,518    
Representative's Warrant [Member]                      
Class of Stock [Line Items]                      
Warrants to purchase shares of common stock               20,641      
Warrant exercise price per share               $ 75.00      
Class of warrant purchase percentage               3.00%      
Warrant expiration date               Aug. 27, 2019      
Warrant exercisable period               180 days      
Number of warrants or rights outstanding [2]                 20,641    
[1] During 2019 and 2018 the PIPE Warrants to purchase common stock expired in accordance with their terms. Only 553 of the PIPE Warrants were exercised prior to expiration and the remaining PIPE Warrants were terminated and are no longer exercisable.
[2] On August 27, 2019, the Representative’s Warrant to purchase common stock expired in accordance with its terms. The Representative’s Warrant was not exercised prior to expiration and has been terminated and is no longer exercisable.