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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Exchangeable Shares
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning Balance at Dec. 31, 2020 $ (3,921) $ 5   $ 102,361   $ (106,287)
Beginning Balance, shares at Dec. 31, 2020   5,241        
Stock-based compensation 1,177     1,177    
Net loss (4,157)         (4,157)
Ending Balance at Mar. 31, 2021 (6,901) $ 5   103,538   (110,444)
Ending Balance, shares at Mar. 31, 2021   5,241        
Beginning Balance at Dec. 31, 2020 (3,921) $ 5   102,361   (106,287)
Beginning Balance, shares at Dec. 31, 2020   5,241        
Net loss (13,407)          
Ending Balance at Sep. 30, 2021 (13,836) $ 5   105,854   (119,695)
Ending Balance, shares at Sep. 30, 2021   5,709        
Beginning Balance at Dec. 31, 2020 (3,921) $ 5   102,361   (106,287)
Beginning Balance, shares at Dec. 31, 2020   5,241        
Net loss (10,900)          
Ending Balance at Dec. 31, 2021 42,069 $ 12   159,256   (117,199)
Ending Balance, shares at Dec. 31, 2021   12,284 9,295      
Beginning Balance at Mar. 31, 2021 (6,901) $ 5   103,538   (110,444)
Beginning Balance, shares at Mar. 31, 2021   5,241        
Issuance of common stock under stock plan, net 30     30    
Issuance of common stock under stock plan, net, shares   16        
Stock-based compensation 1,137     1,137    
Net loss (5,430)         (5,430)
Ending Balance at Jun. 30, 2021 (11,164) $ 5   104,705   (115,874)
Ending Balance, shares at Jun. 30, 2021   5,257        
Issuance of common stock under stock plan, net 1     1    
Issuance of common stock under stock plan, net, shares   452        
Stock-based compensation 1,148     1,148    
Net loss (3,821)         (3,821)
Ending Balance at Sep. 30, 2021 (13,836) $ 5   105,854   (119,695)
Ending Balance, shares at Sep. 30, 2021   5,709        
Beginning Balance at Dec. 31, 2021 42,069 $ 12   159,256   (117,199)
Beginning Balance, shares at Dec. 31, 2021   12,284 9,295      
Exchange of exchangeable shares   100 (100)      
Issuance of common stock under stock plan, net (9)     (9)    
Issuance of common stock under stock plan, net, shares   9        
Stock-based compensation 1,171     1,171    
Net unrealized gain (loss) on available-for-sale securities (37)       $ (37)  
Net loss (6,754)         (6,754)
Ending Balance at Mar. 31, 2022 36,440 $ 12   160,418 (37) (123,953)
Ending Balance, shares at Mar. 31, 2022   12,393 9,195      
Beginning Balance at Dec. 31, 2021 42,069 $ 12   159,256   (117,199)
Beginning Balance, shares at Dec. 31, 2021   12,284 9,295      
Net unrealized gain (loss) on available-for-sale securities (36)          
Net loss (17,805)          
Ending Balance at Sep. 30, 2022 28,524 $ 13   163,551 (36) (135,004)
Ending Balance, shares at Sep. 30, 2022   12,757 9,112      
Beginning Balance at Mar. 31, 2022 36,440 $ 12   160,418 (37) (123,953)
Beginning Balance, shares at Mar. 31, 2022   12,393 9,195      
Issuance of common stock under stock plan, net (50) $ 1   (51)    
Issuance of common stock under stock plan, net, shares   244        
Stock-based compensation 1,738     1,738    
Net unrealized gain (loss) on available-for-sale securities (4)       (4)  
Net loss (7,043)         (7,043)
Ending Balance at Jun. 30, 2022 31,081 $ 13   162,105 (41) (130,996)
Ending Balance, shares at Jun. 30, 2022   12,637 9,195      
Exchange of exchangeable shares   83 (83)      
Issuance of common stock under stock plan, net (2)     (2)    
Issuance of common stock under stock plan, net, shares   37        
Stock-based compensation 1,448     1,448    
Net unrealized gain (loss) on available-for-sale securities 5       5  
Net loss (4,008)         (4,008)
Ending Balance at Sep. 30, 2022 $ 28,524 $ 13   $ 163,551 $ (36) $ (135,004)
Ending Balance, shares at Sep. 30, 2022   12,757 9,112