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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Class A
Class B
Common Stock
Class A
Common Stock
Class B
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Beginning Balance at Dec. 31, 2018 $ 95,026     $ 53 $ 370   $ 350,801 $ (256,198)
Beginning Balance (in shares) at Dec. 31, 2018       5,056 36,965      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 194       $ 1 $ (1) 194  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         129 (90)    
Stock compensation from options and restricted stock, net of forfeitures 545           545  
Net loss (1,299)             (1,299)
Ending Balance at Mar. 31, 2019 94,466     $ 53 $ 371 $ (1) 351,540 (257,497)
Ending Balance (in shares) at Mar. 31, 2019       5,056 37,094      
Ending Balance, share at Mar. 31, 2019           90    
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 1,551       $ 9   1,542  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         928      
Conversion of Class A common stock to Class B common stock       $ (4) $ 4      
Conversion of Class A common stock to Class B common stock (in shares)       (395) 395      
Stock compensation from options and restricted stock, net of forfeitures 782           782  
Retirement of treasury stock         $ (1) $ 1    
Retirement of treasury stock (in shares)         (90) 90    
Net loss (1,114)             (1,114)
Ending Balance at Jun. 30, 2019 95,685     $ 49 $ 383   353,864 (258,611)
Ending Balance (in shares) at Jun. 30, 2019       4,661 38,327      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 94       $ 1   93  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         100      
Stock compensation from options and restricted stock, net of forfeitures 824           824  
Net loss (1,215)             (1,215)
Ending Balance at Sep. 30, 2019 95,388     $ 49 $ 384   354,781 (259,826)
Ending Balance (in shares) at Sep. 30, 2019       4,661 38,427      
Beginning Balance at Dec. 31, 2019 99,838     $ 49 $ 396   359,633 (260,240)
Beginning Balance (in shares) at Dec. 31, 2019   4,661,000 39,610,000 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 8       $ 2   6  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         158      
Stock compensation from options and restricted stock, net of forfeitures 1,057           1,057  
Net loss (24,875)             (24,875)
Ending Balance at Mar. 31, 2020 76,028     $ 49 $ 398   360,696 (285,115)
Ending Balance (in shares) at Mar. 31, 2020       4,661 39,768      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 20       $ 1   19  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         124      
Stock compensation from options and restricted stock, net of forfeitures 907           907  
Net loss (4,508)             (4,508)
Ending Balance at Jun. 30, 2020 72,447     $ 49 $ 399   361,622 (289,623)
Ending Balance (in shares) at Jun. 30, 2020       4,661 39,892      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 24       $ 18   24  
Stock compensation from options and restricted stock, net of forfeitures 879           879  
Net loss (3,665)             (3,665)
Ending Balance at Sep. 30, 2020 $ 69,685     $ 49 $ 399   $ 362,525 $ (293,288)
Ending Balance (in shares) at Sep. 30, 2020   4,661,000 39,910,000 4,661 39,910