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Consolidated Statements of Stockholders Equity - USD ($)
$ in Thousands
Total
Class A Common Stock [Member]
Class B Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2018 $ 43,184 $ 8 $ 18 $ 143,050 $ (99,892)  
Beginning balance, shares at Dec. 31, 2018   7,528,741 17,696,414      
Issuance of common stock upon exercise of stock options 2,982 $ 1   2,981    
Issuance of common stock upon exercise of stock options, shares   645,920        
Vesting of restricted stock units, shares   567,100        
Stock-based compensation expense 12,721     12,721    
Transfer of Class B common stock to Class A common stock   $ 6 $ (6)      
Transfer of Class B common stock to Class A common stock, shares   5,894,073 (5,894,073)      
Net loss (7,117)       (7,117)  
Ending balance at Dec. 31, 2019 51,770 $ 15 $ 12 158,752 (107,009)  
Ending balance, shares at Dec. 31, 2019   14,635,834 11,802,341      
Contingent consideration to be settled in Class A common stock 1,335     1,335    
Issuance of common stock upon exercise of stock options $ 4,907 $ 1   4,906    
Issuance of common stock upon exercise of stock options, shares 776,914 776,914        
Vesting of restricted stock units, shares   998,478        
Stock-based compensation expense $ 24,179     24,179    
Transfer of Class B common stock to Class A common stock   $ 5 $ (5)      
Transfer of Class B common stock to Class A common stock, shares   4,372,839 (4,372,839)      
Foreign currency translation adjustment (7)         $ (7)
Net loss (11,202)       (11,202)  
Ending balance at Dec. 31, 2020 $ 70,982 $ 21 $ 7 $ 189,172 $ (118,211) $ (7)
Ending balance, shares at Dec. 31, 2020   20,784,065 7,429,502