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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
Accumulated deficit
Beginning Balance at Dec. 31, 2018 $ 95,026     $ 53 $ 370   $ 350,801 $ (256,198)
Beginning Balance (in shares) at Dec. 31, 2018       5,056,000 36,965,000      
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 1,903       $ 15 $ (1) 1,889  
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         1,491,000 (90,000)    
Stock-based compensation from options and restricted stock, net of forfeitures 3,147           3,147  
Retirement of treasury stock         $ (1) $ 1    
Retirement of treasury stock (in shares)         (90,000) 90,000    
Deferred issuance of Class B common stock in connection with acquisition 3,803           3,803  
Issuance of Class B common stock in connection with prior deferred issuance from acquisition         $ 8   (8)  
Issuance of Class B common stock in connection with prior deferred issuance from acquisition (in shares)         849,000      
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)       (395,000) 395,000      
Net loss (4,042)             (4,042)
Ending Balance at Dec. 31, 2019 99,837     $ 49 $ 396   359,632 (260,240)
Ending Balance (in shares) at Dec. 31, 2019   4,661,000 39,610,000 4,661,000 39,610,000      
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)         722,000 (5,000,000)    
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)         (5,000,000) 5,000,000    
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)         1,130,000      
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   4,661,000 36,462,000 4,661,000 36,462,000