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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Mar. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Warrants issued   42,253  
Weighted average exercise price of warrants issued   $ 7.10  
Outstanding warrants   142,359  
Outstanding warrants, weighted average exercise price   $ 6.85  
Loan and Security Agreement [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Amount drew on agreement   $ 10.0  
2004 Equity Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant of options   2,300,000  
Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units outstanding     171,250
Award date fair value per unit     $ 7.00
Units vested 171,250