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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, 2020 $ 52,688     $ 49 $ 365   $ 350,960 $ (298,686)
Beginning Balance (in shares) at Dec. 31, 2020       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 32       $ 2   30  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         223      
Stock compensation from options and restricted stock, net of forfeitures 744           744  
Net income (loss) (5,332)             (5,332)
Ending Balance at Mar. 31, 2021 48,132     $ 49 $ 367   351,734 (304,018)
Ending Balance (in shares) at Mar. 31, 2021       4,661 36,685      
Beginning Balance at Dec. 31, 2021 51,502     $ 49 $ 374   354,155 (303,076)
Beginning Balance (in shares) at Dec. 31, 2021   4,661 37,391 4,661 37,391 (23)    
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 16       $ 3   13  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         285      
Retirements Of Restricted Stock (in shares)         (23) 23    
Stock compensation from options and restricted stock, net of forfeitures 695           695  
Net income (loss) (1,582)             (1,582)
Ending Balance at Mar. 31, 2022 $ 50,631     $ 49 $ 377   $ 354,863 $ (304,658)
Ending Balance (in shares) at Mar. 31, 2022   4,661 37,653 4,661 37,653