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Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Stockholders Equity Note [Line Items]      
Shares issuable under Stock Option Plan, as percent of shares outstanding   25.00%  
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period   0  
Proceeds from Stock Options Exercised     $ 17
Canadian dollars [Member]      
Stockholders Equity Note [Line Items]      
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period     10
U.S.dollars [Member]      
Stockholders Equity Note [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1.98 $ 1.98  
Class Or Warrant Or Right Outstanding Weighted Average Remaining Contractual Terms   1 year 11 months 26 days  
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period 6    
Proceeds from Stock Options Exercised $ 4    
Private Placement [Member]      
Stockholders Equity Note [Line Items]      
Stock Issued During Period, Shares, New Issues 2,632    
Proceeds from Issuance of Private Placement $ 5,000    
Equity Issuance Per Share Amounts $ 1.90    
Maximum [Member]      
Stockholders Equity Note [Line Items]      
Shares issuable under Stock Option Plan 3,410 3,410