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Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Balance at beginning of period (in shares) at Dec. 31, 2019 4,471,316        
Balance at beginning of period at Dec. 31, 2019 $ 5,712        
Balance at end of period (in shares) at Sep. 30, 2020 4,471,316        
Balance at end of period at Sep. 30, 2020 $ 5,712        
Balance at beginning of period (in shares) at Dec. 31, 2019   17,349,695      
Balance at beginning of period at Dec. 31, 2019 (9,430) $ 17 $ 2,918 $ (18) $ (12,347)
Stockholders’ Deficit          
Issuance of common stock for cash upon exercise of stock options (in shares)   233,644      
Issuance of common stock for cash upon exercise of stock options 112 $ 1 111    
Issuance of common stock for settlement of restricted stock units (in shares)   83,737      
Stock-based compensation expense 281   281    
Net loss (10,836)       (10,836)
Balance at end of period (in shares) at Sep. 30, 2020   17,667,076      
Balance at end of period at Sep. 30, 2020 $ (19,873) $ 18 3,310 (18) (23,183)
Balance at beginning of period (in shares) at Jun. 30, 2020 4,471,316        
Balance at beginning of period at Jun. 30, 2020 $ 5,712        
Balance at end of period (in shares) at Sep. 30, 2020 4,471,316        
Balance at end of period at Sep. 30, 2020 $ 5,712        
Balance at beginning of period (in shares) at Jun. 30, 2020   17,563,777      
Balance at beginning of period at Jun. 30, 2020 (16,160) $ 18 3,179 (18) (19,339)
Stockholders’ Deficit          
Issuance of common stock for cash upon exercise of stock options (in shares)   37,062      
Issuance of common stock for cash upon exercise of stock options 20   20    
Issuance of common stock for settlement of restricted stock units (in shares)   66,237      
Stock-based compensation expense 111   111    
Net loss (3,844)       (3,844)
Balance at end of period (in shares) at Sep. 30, 2020   17,667,076      
Balance at end of period at Sep. 30, 2020 $ (19,873) $ 18 3,310 (18) (23,183)
Balance at beginning of period (in shares) at Dec. 31, 2020 4,471,316        
Balance at beginning of period at Dec. 31, 2020 $ 5,712        
Balance at end of period (in shares) at Sep. 30, 2021 4,471,316        
Balance at end of period at Sep. 30, 2021 $ 5,712        
Balance at beginning of period (in shares) at Dec. 31, 2020 18,486,989 18,486,989      
Balance at beginning of period at Dec. 31, 2020 $ (12,008) $ 18 3,612 (31) (15,607)
Stockholders’ Deficit          
Issuance of common stock (in shares)   1,250,000      
Issuance of common stock $ 5,437 $ 2 5,435    
Issuance of common stock for cash upon exercise of stock options (in shares) 832,329 832,329      
Issuance of common stock for cash upon exercise of stock options $ 328 $ 1 327    
Issuance of common stock for settlement of restricted stock units (in shares)   38,533      
Stock-based compensation expense 1,144   1,144    
Net loss $ (15,594)       (15,594)
Balance at end of period (in shares) at Sep. 30, 2021 20,607,851 20,607,851      
Balance at end of period at Sep. 30, 2021 $ (20,693) $ 21 10,518 (31) (31,201)
Balance at beginning of period (in shares) at Jun. 30, 2021 4,471,316        
Balance at beginning of period at Jun. 30, 2021 $ 5,712        
Balance at end of period (in shares) at Sep. 30, 2021 4,471,316        
Balance at end of period at Sep. 30, 2021 $ 5,712        
Balance at beginning of period (in shares) at Jun. 30, 2021   20,525,254      
Balance at beginning of period at Jun. 30, 2021 (16,189) $ 21 10,054 (31) (26,233)
Stockholders’ Deficit          
Issuance of common stock for cash upon exercise of stock options (in shares)   60,395      
Issuance of common stock for cash upon exercise of stock options 31   31    
Issuance of common stock for settlement of restricted stock units (in shares)   22,202      
Stock-based compensation expense 433   433    
Net loss $ (4,968)       (4,968)
Balance at end of period (in shares) at Sep. 30, 2021 20,607,851 20,607,851      
Balance at end of period at Sep. 30, 2021 $ (20,693) $ 21 $ 10,518 $ (31) $ (31,201)