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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Class A
Class B
Class A common stock
Class A
Class A common stock
Class B
Treasury stock
Additional paid-in capital
Accumulated deficit
Beginning Balance (in shares) at Dec. 31, 2017       5,056 38,736      
Beginning Balance at Dec. 31, 2017 $ 89,999     $ 53 $ 387   $ 343,268 $ (253,709)
Issuance of common stock upon exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net 27       $ 1   26  
Issuance of common stock from exercise of options, issuance and vesting of restricted stock and under employee stock purchase plan, net (in shares)         36      
Stock compensation from options and restricted stock, net of forfeitures 951           951  
Cumulative effect of a change in accounting principle related to revenue recognition | ASC 606 189             189
Net loss (926)             (926)
Ending Balance at Mar. 31, 2018 90,240     $ 53 $ 388   344,245 (254,446)
Ending Balance (in shares) at Mar. 31, 2018       5,056 38,772      
Beginning Balance (in shares) at Dec. 31, 2018   5,056 36,965 5,056 36,965      
Beginning Balance at Dec. 31, 2018 95,026     $ 53 $ 370   350,801 (256,198)
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 37,004 5,056 37,094      
Ending Balance, share at Mar. 31, 2019           (90)