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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance (in shares) at Mar. 31, 2017   91,500,091      
Beginning balance at Mar. 31, 2017 $ 288,601 $ 91 $ 412,762 $ (9,642) $ (114,610)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under stock plans, less withholding (in shares)   2,709,990      
Issuance of common stock under stock plans, less withholding 2,182 $ 3 2,179    
Repurchases of common stock (in shares)   (1,362,727)      
Repurchases of common stock (17,934) $ (1) (17,933)    
Stock-based compensation expense 28,782   28,782    
Unrealized investment gain (loss) (259)     (259)  
Foreign currency translation adjustment 4,256     4,256  
Net loss (104,497)       (104,497)
Ending balance (in shares) at Mar. 31, 2018   92,847,354      
Ending balance at Mar. 31, 2018 218,774 $ 93 425,790 (5,645) (201,464)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under stock plans, less withholding (in shares)   3,272,534      
Issuance of common stock under stock plans, less withholding 4,486 $ 3 4,483    
Stock-based compensation expense 45,548   45,548    
Unrealized investment gain (loss) 473     473  
Foreign currency translation adjustment (2,181)     (2,181)  
Equity component of convertible senior notes, net of issuance costs 31,128   31,128    
Net loss (88,739)       (88,739)
Ending balance (in shares) at Mar. 31, 2019   96,119,888      
Ending balance at Mar. 31, 2019 249,390 $ 96 506,949 (7,353) (250,302)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under stock plans, less withholding (in shares)   4,452,267      
Issuance of common stock under stock plans, less withholding 7,777 $ 4 7,773    
Issuance of common stock related to acquisition (in shares)   2,606,466      
Issuance of common stock related to acquisition 35,840 $ 3 35,837    
Stock-based compensation expense 71,821   71,821    
Unrealized investment gain (loss) (203)     (203)  
Foreign currency translation adjustment (4,620)     (4,620)  
Equity component of convertible senior notes, net of issuance costs 3,094   3,094    
Net loss (172,368)       (172,368)
Ending balance (in shares) at Mar. 31, 2020   103,178,621      
Ending balance at Mar. 31, 2020 $ 190,731 $ 103 $ 625,474 $ (12,176) $ (422,670)