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Common stock, preferred stock and warrants - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 11, 2016
USD ($)
Stockholder
shares
Feb. 22, 2016
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
Stockholder
shares
Dec. 08, 2015
shares
Jul. 31, 2015
shares
Mar. 21, 2015
shares
Equity [Line Items]              
Common stock, shares issued     46,979,395 15,709,786      
Number of stockholders | Stockholder       4      
Number of common stock shares that warrants to purchase       1,589,830   640,205  
Cancellation of warrants to purchase common stock     749,625        
Warrants outstanding     840,205        
Treasury stock, shares     55,212 0      
Treasury stock, value | $     $ 272        
Warrants Issued To Institutional Investor              
Equity [Line Items]              
Warrants outstanding           640,205  
Exercise price of warrants | $ / shares     $ 10.00        
Warrants exercise period     6 months        
Warrants expiration period     36 months        
Whitehorse Warrants [Member]              
Equity [Line Items]              
Number of common stock shares that warrants to purchase     200,000        
Warrants outstanding     200,000        
Exercise price of warrants | $ / shares     $ 8.00        
Restricted Stock Units [Member]              
Equity [Line Items]              
Shares issued as a result of vesting     387,754        
Common shares withheld to pay withholding taxes     55,212        
Vendor [Member]              
Equity [Line Items]              
Number of restricted shares issued, in shares     12,000        
Common Stock [Member]              
Equity [Line Items]              
Contingent earn out stock issued related to merger, shares 900,108            
Exchangeable Shares [Member]              
Equity [Line Items]              
Common stock approved by the Board of Directors in exchange of warrants, shares 1,069,728            
Number of stockholders | Stockholder 4            
Aggregate exchange shares issued     749,625        
Other expenses, net | $ $ 297            
Number of common stock shares that warrants to purchase     749,625        
Series B Preferred Stock [Member]              
Equity [Line Items]              
Series B Preferred stock to be converted   450,962          
Common stock, shares issued upon conversion   22,548,100     50    
Ratio of conversion   50          
Preferred stock, shares issued         100    
Series A Preferred Stock [Member]              
Equity [Line Items]              
Contingent earn out stock issued related to merger, shares 1,800,220            
Convertible Series A preferred stock [Member]              
Equity [Line Items]              
Preferred stock, shares issued     0 4,871,802     4,965,302
Conversion of Series A preferred stock into common stock, shares     (6,672,022)        
Preferred stock, shares outstanding     0 4,871,802      
Convertible Series B preferred stock [Member]              
Equity [Line Items]              
Preferred stock, shares issued     0 450,962      
Preferred stock, shares outstanding     0 450,962