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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Common stock, beginning balance (in shares) at Dec. 31, 2018     115,500,000        
Beginning balance at Dec. 31, 2018 $ 410,634 $ (111) $ 116 $ 818,113 $ (1,019) $ (406,576) $ (111)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member            
Equity component of convertible senior notes, net of issuance costs $ 206,747     206,747      
Purchase of convertible senior notes capped call (97,200)     (97,200)      
Repurchase of common stock (in shares)     (504,000)        
Repurchase of common stock (20,000)   $ (1) (19,999)      
Issuance of common stock upon exercise of stock options and ESPP (in shares)     1,554,000        
Issuance of common stock upon exercise of stock options and ESPP 16,046   $ 2 16,044      
Net issuance of common stock for settlement of RSUs (in shares)     2,745,000        
Net issuance of common stock for settlement of RSUs (82,249)   $ 2 (82,251)      
Issuance of common stock in connection with prior acquisition (in shares)     41,000        
Issuance of common stock in connection with prior acquisition 1,160     1,160      
Share-based compensation expense 30,490     30,490      
Other comprehensive income (loss) 401       401    
Net income (6,347)         (6,347)  
Common stock, ending balance (in shares) at Jun. 30, 2019     119,336,000        
Beginning balance at Jun. 30, 2019 459,571   $ 119 873,104 (618) (413,034)  
Common stock, beginning balance (in shares) at Mar. 31, 2019     118,197,000        
Beginning balance at Mar. 31, 2019 428,137   $ 118 839,924 (900) (411,005)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Equity component of convertible senior notes, net of issuance costs 25,860     25,860      
Purchase of convertible senior notes capped call (12,150)     (12,150)      
Issuance of common stock upon exercise of stock options and ESPP (in shares)     845,000        
Issuance of common stock upon exercise of stock options and ESPP 10,226   $ 1 10,225      
Net issuance of common stock for settlement of RSUs (in shares)     294,000        
Net issuance of common stock for settlement of RSUs (6,207)   $ 0 (6,207)      
Share-based compensation expense 15,452     15,452      
Other comprehensive income (loss) 282       282    
Net income (2,029)         (2,029)  
Common stock, ending balance (in shares) at Jun. 30, 2019     119,336,000        
Beginning balance at Jun. 30, 2019 $ 459,571   $ 119 873,104 (618) (413,034)  
Common stock, beginning balance (in shares) at Dec. 31, 2019 121,583,501   121,584,000        
Beginning balance at Dec. 31, 2019 $ 498,829 $ (88) $ 122 916,095 (1,096) (416,292) $ (88)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member            
Issuance of common stock upon exercise of stock options and ESPP (in shares)     672,000        
Issuance of common stock upon exercise of stock options and ESPP $ 8,037   $ 0 8,037      
Net issuance of common stock for settlement of RSUs (in shares)     1,867,000        
Net issuance of common stock for settlement of RSUs (54,102)   $ 2 (54,104)      
Share-based compensation expense 37,880     37,880      
Other comprehensive income (loss) 2,946       2,946    
Net income $ 4,876         4,876  
Common stock, ending balance (in shares) at Jun. 30, 2020 124,122,675   124,123,000        
Beginning balance at Jun. 30, 2020 $ 498,378   $ 124 907,908 1,850 (411,504)  
Common stock, beginning balance (in shares) at Mar. 31, 2020     123,543,000        
Beginning balance at Mar. 31, 2020 462,927   $ 124 890,258 (5,362) (422,093)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock upon exercise of stock options and ESPP (in shares)     312,000        
Issuance of common stock upon exercise of stock options and ESPP 5,372   $ 0 5,372      
Net issuance of common stock for settlement of RSUs (in shares)     268,000        
Net issuance of common stock for settlement of RSUs (7,268)   $ 0 (7,268)      
Share-based compensation expense 19,546     19,546      
Other comprehensive income (loss) 7,212       7,212    
Net income $ 10,589         10,589  
Common stock, ending balance (in shares) at Jun. 30, 2020 124,122,675   124,123,000        
Beginning balance at Jun. 30, 2020 $ 498,378   $ 124 $ 907,908 $ 1,850 $ (411,504)