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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2017 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Class A common stock
Common Stock
Class B common stock
Additional Paid-in Capital
Accumulated Other Comprehensive (Loss)/Income
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2016   11,691 22,028      
Beginning balance at Dec. 31, 2016 $ 69,682 $ 1 $ 3 $ 146,692 $ (51) $ (76,963)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares) 133 133        
Exercise of stock options $ 508     508    
Stock-based compensation 4,674     4,674    
Vesting of restricted stock units, net of shares withheld for taxes (in shares)   81        
Vesting of restricted stock units, net of shares withheld for taxes (1,421)     (1,421)    
Vesting of early exercised shares 67     67    
Conversion of Class B stock to Class A stock (in shares)   2,580 (2,580)      
Conversion of Class B stock to Class A stock 0          
Issuance of restricted stock awards (in shares)   9        
Other comprehensive income 28       28  
Net income 7,139         7,139
Ending balance (in shares) at Sep. 30, 2017   14,494 19,448      
Ending balance at Sep. 30, 2017 $ 80,677 $ 1 $ 3 $ 150,520 $ (23) $ (69,824)