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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Feb. 28, 2017
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Purchase price of common shares   $ 10.70    
Gross proceeds from issuance of common stock   $ 77,800    
Proceeds from issuance of common stock, net of issuance costs   $ 74,300   $ 80,837
Common stock sold and issued   7,242,992    
Warrants issued to purchase common stock   2,172,899    
Warrants exercise price per share   $ 13.91    
Purchase price for warrants   $ 0.125    
Warrants description     The warrants are exercisable for an exercise price of $13.91 per share.  
Number of warrants exercised     0  
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares sold under ESPP 42,845      
Purchase price of common shares $ 8.77      
Proceeds from issuance of shares under the ESPP $ 400      
Options to Purchase Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares purchased by employees on exercise of options     19,301 6,250
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued during period, restricted stock units     15,188 0