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Consolidated statements of convertible preferred stock and stockholders' equity (deficit) - USD ($)
$ in Thousands
Total
Common stock
Employee note receivable
Additional paid-in capital
Accumulated deficit
Beginning balance at Dec. 31, 2015 $ (60,398) $ 0 $ 0 $ 6,785 $ (67,183)
Beginning balance (in shares) at Dec. 31, 2015   34,493      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 5,313       5,313
Stock-based compensation 7,149     7,149  
Dividend paid (72,060)     (9,801) (62,259)
Issuance of employee note receivable (11,932)   (11,932)    
Accrued interest on employee note receivable 0   (39) 39  
Repayment of employee note receivable 11,971   11,971    
Convertible preferred stock accretion (436,317)       (436,317)
Conversion of preferred stock 633,612 $ 372   633,240  
Conversion of preferred stock (in shares)   37,271,375      
Issuance of common stock upon initial public offering 63,240 $ 40   63,200  
Issuance of common stock upon initial public offering (in shares)   4,000,000      
Vesting of early exercised stock options 7,859 $ 22   7,837  
Vesting of early exercised stock options (in shares)   2,169,003      
Exercise of stock options, net 831 $ 3   828  
Exercise of stock options (in shares)   278,440      
Deferred offering costs (8,406)     (8,406)  
Ending balance at Dec. 31, 2016 140,862 $ 438 0 700,871 (560,447)
Ending balance (in shares) at Dec. 31, 2016   43,753,311      
Beginning balance at Dec. 31, 2015 $ 197,295        
Beginning balance (in shares) at Dec. 31, 2015 135,041        
Increase (Decrease) in Temporary Equity [Roll Forward]          
Convertible preferred stock accretion $ 436,317        
Conversion of preferred stock $ (633,612)        
Conversion of preferred stock (in shares) (135,041)        
Ending balance at Dec. 31, 2016 $ 0        
Ending balance (in shares) at Dec. 31, 2016 0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 33,475       33,475
Stock-based compensation 13,474     13,474  
Vesting of early exercised stock options 4,074 $ 15   4,059  
Vesting of early exercised stock options (in shares)   1,522,826      
Exercise of stock options, net 1,978 $ 10   1,968  
Exercise of stock options (in shares)   1,039,493      
Ending balance at Dec. 31, 2017 193,863 $ 463 0 720,372 (526,972)
Ending balance (in shares) at Dec. 31, 2017   46,315,630      
Ending balance at Dec. 31, 2017 $ 0        
Ending balance (in shares) at Dec. 31, 2017 0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 15,525       15,525
Stock-based compensation 16,821     16,821  
Exercise of stock options, net 3,176 $ 15   3,161  
Exercise of stock options (in shares)   1,514,126      
Ending balance at Dec. 31, 2018 229,331 $ 478 $ 0 $ 740,354 $ (511,501)
Ending balance (in shares) at Dec. 31, 2018   47,829,756      
Ending balance at Dec. 31, 2018 $ 0        
Ending balance (in shares) at Dec. 31, 2018 0