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Stock Options and Warrants - Warrants Issued in Connection with October 2014 Financing - Additional Information (Detail) - Placement Agent Warrants [Member]
Mar. 31, 2019
$ / shares
Nov. 25, 2014
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Closing price of common stock $ 1.12  
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Closing price of common stock $ 1.75  
Warrant Exercise Price [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Warrants and rights outstanding, measurement input 1.75 1.75
Stock Price Volatility [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Warrants and rights outstanding, measurement input 77.2  
Risk Free Interest Rate [Member] | U.S. Treasury Notes [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Warrants and rights outstanding, measurement input 2.40  
Options and Warrant Expected Term [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Warrants outstanding term 1 year 14 days  
Dividend Rate [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Warrants and rights outstanding, measurement input 0.00