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Equity - Narrative (Details)
 12 Months Ended
Nov. 13, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
plan
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
shares
Disclosure of classes of share capital [line items]        
Price per share (usd per share) | $ / shares $ 3.5464      
Gross proceeds from offering | $ $ 183,816,000      
Warrants exercised (in shares)   747,563 1,012,500  
Net proceeds on issuance of share capital from warrant exercises | $   $ 1,434,000 $ 2,025,000  
Warrant outstanding (in shares)   0 785,063 1,797,563
Options exercised (in shares)   945,022 1,820,193  
Proceeds from exercise of options | $   $ 1,628,000 $ 3,598,000  
Options granted (in shares)   1,675,640 1,498,776  
Weighted average fair value, share options granted (usd per share) | $   $ 1.70 $ 1.09  
Options outstanding (in shares)   5,133,461 4,828,173 5,537,729
Shares to be issued (in shares)   12,051,923 11,617,902  
Compensation expense | $   $ 2,902,000 $ 3,125,000  
Private Placement - Weichai Power        
Disclosure of classes of share capital [line items]        
Number of shares issued (in shares) 46,131,712      
Gross proceeds from offering | $ $ 163,602,000      
Private Placement - Broad-Ocean        
Disclosure of classes of share capital [line items]        
Number of shares issued (in shares) 5,699,947      
Gross proceeds from offering | $ $ 20,214,000      
Common shares        
Disclosure of classes of share capital [line items]        
Options exercised (in shares)   945,022 1,820,193  
Proceeds from exercise of options | $   $ 1,628,000 $ 3,598,000  
Warrants        
Disclosure of classes of share capital [line items]        
Warrants exercised (in shares)   747,563 1,012,500  
Net proceeds on issuance of share capital from warrant exercises | $   $ 1,434,000 $ 2,025,000  
Warrant outstanding (in shares)   0 785,063  
Stock Option        
Disclosure of classes of share capital [line items]        
Award term   7 years    
Award vesting percentage   33.33%    
Award vesting period   3 years    
Compensation expense | $   $ 1,676,000 $ 1,245,000  
DSUs        
Disclosure of classes of share capital [line items]        
Current year grants | $   $ 307,000 299,000  
Number of shares granted (in shares)   91,361    
Number of shares granted, expensed in prior year (in shares)   88,108    
Adjustment to net income | $   $ 45,000    
Current year grants expensed in prior year | $   380,000    
Compensation expense | $   $ 307,000 679,000  
Expense from share-based payment transactions with employees, awards not yet issued | $     $ 380,000  
Exercised (in shares)   297,600 347,588  
Common shares issued (in shares)   154,752 181,788  
Outstanding (in shares)   747,213 865,344 1,125,250
Granted (in shares)   179,469 87,682  
RSUs        
Disclosure of classes of share capital [line items]        
Options exercised (in shares)   149,980 298,556  
Compensation expense | $   $ 964,000 $ 1,201,000  
Exercised (in shares)   290,820 560,677  
Outstanding (in shares)   1,778,192 1,674,637 1,473,408
Number of plans | plan   2    
Granted (in shares)   379,257 735,978