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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Class A common stock
Common Stock
Class B common stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Retained Earnings/(Accumulated Deficit)
Beginning balance (in shares) at Dec. 31, 2019   16,552,000 17,594,000        
Beginning balance at Dec. 31, 2019 $ 131,950 $ 2 $ 2 $ 161,509 $ 33 $ (21,562) $ (8,034)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options (in shares)   17,000          
Exercise of stock options 97     97      
Stock-based compensation 1,365     1,365      
Vesting of restricted stock units, net of shares withheld for taxes (in shares)   91,000          
Vesting of restricted stock units, net of shares withheld for taxes (6,458)     (6,458)      
Conversion of Class B stock to Class A stock (in shares)   58,000 (58,000)        
Other comprehensive income (loss) $ 132       132    
Repurchase of common stock (in shares) (48,002) (48,000)          
Repurchase of common stock $ (4,194)         (4,194)  
Net income 1,983           1,983
Ending balance (in shares) at Mar. 31, 2020   16,670,000 17,536,000        
Ending balance at Mar. 31, 2020 124,875 $ 2 $ 2 156,513 165 (25,756) (6,051)
Beginning balance (in shares) at Dec. 31, 2019   16,552,000 17,594,000        
Beginning balance at Dec. 31, 2019 131,950 $ 2 $ 2 161,509 33 (21,562) (8,034)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 21,240            
Ending balance (in shares) at Jun. 30, 2020   16,952,000 17,339,000        
Ending balance at Jun. 30, 2020 144,504 $ 2 $ 2 156,919 131 (25,756) 13,206
Beginning balance (in shares) at Mar. 31, 2020   16,670,000 17,536,000        
Beginning balance at Mar. 31, 2020 124,875 $ 2 $ 2 156,513 165 (25,756) (6,051)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options (in shares)   32,000          
Exercise of stock options 232     232      
Stock-based compensation 3,406     3,406      
Vesting of restricted stock units, net of shares withheld for taxes (in shares)   50,000          
Vesting of restricted stock units, net of shares withheld for taxes (3,232)     (3,232)      
Conversion of Class B stock to Class A stock (in shares)   197,000 (197,000)        
Issuance of restricted stock awards (in shares)   3,000          
Other comprehensive income (loss) (34)       (34)    
Net income 19,257           19,257
Ending balance (in shares) at Jun. 30, 2020   16,952,000 17,339,000        
Ending balance at Jun. 30, 2020 144,504 $ 2 $ 2 156,919 131 (25,756) 13,206
Beginning balance (in shares) at Dec. 31, 2020   18,729,000 15,659,000        
Beginning balance at Dec. 31, 2020 285,920 $ 2 $ 2 161,247 56 (25,756) 150,369
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options (in shares)   23,000          
Exercise of stock options 100     100      
Stock-based compensation 3,295     3,295      
Vesting of restricted stock units, net of shares withheld for taxes (in shares)   42,000          
Vesting of restricted stock units, net of shares withheld for taxes (3,992)     (3,992)      
Conversion of Class B stock to Class A stock (in shares)   108,000 (108,000)        
Other comprehensive income (loss) (18)       (18)    
Net income 479           479
Ending balance (in shares) at Mar. 31, 2021   18,902,000 15,551,000        
Ending balance at Mar. 31, 2021 285,784 $ 2 $ 2 160,650 38 (25,756) 150,848
Beginning balance (in shares) at Dec. 31, 2020   18,729,000 15,659,000        
Beginning balance at Dec. 31, 2020 $ 285,920 $ 2 $ 2 161,247 56 (25,756) 150,369
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options (in shares) 120,000            
Net income $ 2,500            
Ending balance (in shares) at Jun. 30, 2021   18,989,000 15,621,000        
Ending balance at Jun. 30, 2021 287,267 $ 2 $ 2 160,160 (10) (25,756) 152,869
Beginning balance (in shares) at Mar. 31, 2021   18,902,000 15,551,000        
Beginning balance at Mar. 31, 2021 285,784 $ 2 $ 2 160,650 38 (25,756) 150,848
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Exercise of stock options (in shares)   13,000 84,000        
Exercise of stock options 545     545      
Stock-based compensation 3,873     3,873      
Vesting of restricted stock units, net of shares withheld for taxes (in shares)   56,000          
Vesting of restricted stock units, net of shares withheld for taxes (4,908)     (4,908)      
Conversion of Class B stock to Class A stock (in shares)   14,000 (14,000)        
Issuance of restricted stock awards (in shares)   4,000          
Other comprehensive income (loss) (48)       (48)    
Net income 2,021           2,021
Ending balance (in shares) at Jun. 30, 2021   18,989,000 15,621,000        
Ending balance at Jun. 30, 2021 $ 287,267 $ 2 $ 2 $ 160,160 $ (10) $ (25,756) $ 152,869