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CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Series A Redeemable Convertible Preferred Stock
Series B Redeemable Convertible Preferred Stock
Balance (in shares) at Dec. 31, 2017           15,848 39,538
Balance at Dec. 31, 2017           $ 49,935 $ 227,800
Redeemable Convertible Preferred Stock [Roll Forward]              
Accretion of Series A and B redeemable convertible preferred stock           $ 11 $ 368
Balance (in shares) at Jun. 30, 2018           15,848 39,538
Balance at Jun. 30, 2018           $ 49,946 $ 228,168
Balance (in shares) at Dec. 31, 2017   24,472          
Balance at Dec. 31, 2017 $ (371,665) $ 246 $ 20,676 $ 0 $ (392,587)    
Increase (Decrease) in Stockholders' Deficit [Roll Forward]              
Accretion of Series A and B redeemable convertible preferred stock (379)   (379)        
Exercise of stock options (in shares)   486          
Exercise of stock options 1,010 $ 5 1,005        
Repurchase of common stock (in shares)   (7)          
Repurchase of common stock (75) $ (1) (74)        
Stock-based compensation 5,423   5,423        
Other comprehensive income 0            
Net loss (33,038)       (33,038)    
Balance (in shares) at Jun. 30, 2018   24,951          
Balance at Jun. 30, 2018 (398,724) $ 250 26,651 0 (425,625)    
Balance (in shares) at Mar. 31, 2018           15,848 39,538
Balance at Mar. 31, 2018           $ 49,940 $ 227,983
Redeemable Convertible Preferred Stock [Roll Forward]              
Accretion of Series A and B redeemable convertible preferred stock           $ 6 $ 185
Balance (in shares) at Jun. 30, 2018           15,848 39,538
Balance at Jun. 30, 2018           $ 49,946 $ 228,168
Balance (in shares) at Mar. 31, 2018   24,794          
Balance at Mar. 31, 2018 (384,863) $ 249 23,363 0 (408,475)    
Increase (Decrease) in Stockholders' Deficit [Roll Forward]              
Accretion of Series A and B redeemable convertible preferred stock (191)   (191)        
Exercise of stock options (in shares)   164          
Exercise of stock options 531 $ 2 529        
Repurchase of common stock (in shares)   (7)          
Repurchase of common stock (75) $ (1) (74)        
Stock-based compensation 3,024   3,024        
Other comprehensive income 0            
Net loss (17,150)       (17,150)    
Balance (in shares) at Jun. 30, 2018   24,951          
Balance at Jun. 30, 2018 $ (398,724) $ 250 26,651 0 (425,625)    
Balance (in shares) at Dec. 31, 2018           0 0
Balance at Dec. 31, 2018           $ 0 $ 0
Balance (in shares) at Jun. 30, 2019           0 0
Balance at Jun. 30, 2019           $ 0 $ 0
Balance (in shares) at Dec. 31, 2018 93,126 93,126          
Balance at Dec. 31, 2018 $ 121,763 $ 931 586,940 0 (466,108)    
Increase (Decrease) in Stockholders' Deficit [Roll Forward]              
Exercise of stock options (in shares) 3,242 3,242          
Exercise of stock options $ 12,727 $ 32 12,695        
Vesting of restricted stock units (in shares)   1          
Vesting of restricted stock units 0            
Issuance of common stock under employee stock purchase plan (in shares)   439          
Issuance of common stock under employee stock purchase plan 8,579 $ 5 8,574        
Stock-based compensation 20,878   20,878        
Other comprehensive income 80     80      
Net loss $ (43,068)       (43,068)    
Balance (in shares) at Jun. 30, 2019 96,808 96,808          
Balance at Jun. 30, 2019 $ 120,959 $ 968 629,087 80 (509,176)    
Balance (in shares) at Mar. 31, 2019           0 0
Balance at Mar. 31, 2019           $ 0 $ 0
Balance (in shares) at Jun. 30, 2019           0 0
Balance at Jun. 30, 2019           $ 0 $ 0
Balance (in shares) at Mar. 31, 2019   96,203          
Balance at Mar. 31, 2019 128,209 $ 962 614,774 21 (487,548)    
Increase (Decrease) in Stockholders' Deficit [Roll Forward]              
Exercise of stock options (in shares)   604          
Exercise of stock options 2,849 $ 6 2,843        
Vesting of restricted stock units (in shares)   1          
Vesting of restricted stock units 0            
Stock-based compensation 11,470   11,470        
Other comprehensive income 59     59      
Net loss $ (21,628)       (21,628)    
Balance (in shares) at Jun. 30, 2019 96,808 96,808          
Balance at Jun. 30, 2019 $ 120,959 $ 968 $ 629,087 $ 80 $ (509,176)