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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY - 9 months ended Oct. 31, 2018 - USD ($)
$ in Thousands
Total
Class A and Class B Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2018   50,575,571        
Beginning balance at Jan. 31, 2018 $ 193,493 $ 51 $ 638,680 $ (1,319) $ (159) $ (443,760)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock option exercises (in shares) 2,540,312 2,540,312        
Stock option exercises $ 17,585 $ 2 17,583      
Repurchase of early exercised options (in shares)   (35,563)        
Repurchase of early exercised options 0 $ 0 0      
Vesting of early exercised stock options 1,045   1,045      
Vesting of restricted stock units (in shares)   138,812        
Vesting of restricted stock units 0 $ 0 0      
Stock-based compensation 26,850   26,850      
Issuance of common stock under the Employee Stock Purchase Plan (in shares)   277,117        
Issuance of common stock under the Employee Stock Purchase Plan 5,626   5,626      
Equity component of convertible senior notes 81,683   81,683      
Purchase of capped calls (37,086)   (37,086)      
Unrealized loss on available-for-sale securities (43)       (43)  
Foreign currency translation adjustment (178)       (178)  
Net loss (91,730)         (91,730)
Ending balance (in shares) at Oct. 31, 2018   53,496,249        
Ending balance at Oct. 31, 2018 $ 197,245 $ 53 $ 734,381 $ (1,319) $ (380) $ (535,490)