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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, Common
Additional Paid-in Capital
Accumulated Deficit
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 (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 treasury stock (in shares)         (23) 23    
Stock-based compensation from options and restricted stock, net of forfeitures 695           695  
Net 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      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 7           7  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         5      
Stock-based compensation from options and restricted stock, net of forfeitures 714           714  
Net loss (1,531)             (1,531)
Ending Balance at Jun. 30, 2022 49,821     $ 49 $ 377   355,584 (306,189)
Ending Balance (in shares) at Jun. 30, 2022       4,661 37,658      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 7           7  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         82      
Stock-based compensation from options and restricted stock, net of forfeitures 625           625  
Net loss (1,558)             (1,558)
Ending Balance at Sep. 30, 2022 48,895     $ 49 $ 377   356,216 (307,747)
Ending Balance (in shares) at Sep. 30, 2022       4,661 37,740      
Beginning Balance at Dec. 31, 2022 44,112     $ 49 $ 385   354,999 (311,321)
Beginning Balance (in shares) at Dec. 31, 2022   4,661 38,497 4,661 38,497      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 12       $ 3   9  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         282      
Retirements of treasury stock (1)       $ (1)      
Retirements of treasury stock (in shares)         (105)      
Stock-based compensation from options and restricted stock, net of forfeitures 799           799  
Net loss (4,476)             (4,476)
Ending Balance at Mar. 31, 2023 40,446     $ 49 $ 387   355,807 (315,797)
Ending Balance (in shares) at Mar. 31, 2023       4,661 38,674      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 7           7  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         22      
Stock-based compensation from options and restricted stock, net of forfeitures 701           701  
Net loss (2,744)             (2,744)
Ending Balance at Jun. 30, 2023 38,410     $ 49 $ 387   356,515 (318,541)
Ending Balance (in shares) at Jun. 30, 2023       4,661 38,696      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 5       $ 1   4  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         88      
Retirements of treasury stock (1)       $ (1)      
Retirements of treasury stock (in shares)         (129)      
Stock-based compensation from options and restricted stock, net of forfeitures 407           407  
Net loss (1,547)             (1,547)
Ending Balance at Sep. 30, 2023 $ 37,274     $ 49 $ 387   $ 356,926 $ (320,088)
Ending Balance (in shares) at Sep. 30, 2023   4,661 38,784 4,661 38,655