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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Class A
Class B
Common stock
Class A
Common stock
Class B
Treasury stock
Additional paid-in capital
Accumulated deficit
Beginning Balance at Dec. 31, 2019 $ 99,837     $ 49 $ 396   $ 359,632 $ (260,240)
Beginning Balance (in shares) at Dec. 31, 2019       4,661 39,610      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (10,873)       $ 8 $ (10,852) (29)  
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         722 (5,000)    
Stock-based compensation from options and restricted stock, net of forfeitures 3,834           3,834  
Repurchase and retirement of treasury stock 102       $ (50) $ 10,852 (10,700)  
Repurchase and retirement of treasury stock (in shares)         (5,000) 5,000    
Issuance of Class B common stock in connection with prior deferred issuance from acquisition         $ 11   (11)  
Issuance of Class B common stock in connection with prior deferred issuance from acquisition (in shares)         1,130      
Divestiture consideration, net (1,766)           (1,766)  
Net loss (38,446)             (38,446)
Ending Balance at Dec. 31, 2020 52,688     $ 49 $ 365   350,960 (298,686)
Ending Balance (in shares) at Dec. 31, 2020   4,661 36,462 4,661 36,462      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 530       $ 6   524  
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         648      
Stock-based compensation from options and restricted stock, net of forfeitures 2,674           2,674  
Repurchase and retirement of treasury stock (in shares)           (23)    
Issuance of Class B common stock in connection with prior deferred issuance from acquisition         $ 3   (3)  
Issuance of Class B common stock in connection with prior deferred issuance from acquisition (in shares)         281      
Net loss (4,390)             (4,390)
Ending Balance at Dec. 31, 2021 $ 51,502     $ 49 $ 374   $ 354,155 $ (303,076)
Ending Balance (in shares) at Dec. 31, 2021   4,661 37,391 4,661 37,391 (23)