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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Gain (Loss)
1.125% convertible notes
1.125% convertible notes
Additional Paid-in Capital
1.375% convertible notes
1.375% convertible notes
Additional Paid-in Capital
Balance (in shares) at Dec. 31, 2016   111,054,000              
Balance at Dec. 31, 2016 $ 552,782 $ 111 $ 1,181,230 $ (615,051) $ (13,508)        
Increase (Decrease) in Stockholders' Equity                  
Net income (loss) (22,862) 0 0 (22,862) 0        
Foreign currency translation adjustment 7,798       7,798        
Unrealized gain (loss) on marketable securities, net of tax 613 0 0 0 613        
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan 10,733 $ 3 10,730 0 0        
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   2,727,000              
Stock Repurchased and Retired During Period, Shares   (4,017,000)              
Stock Repurchased and Retired During Period, Value   $ (4) (13,477) (36,557) 0        
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program (50,038)                
Stock-based compensation 27,403 $ 0 27,403 0 0        
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt           $ (16,651) $ (16,651) $ 33,913 $ 33,913
Adjustments to Additional Paid in Capital, Purchase of convertible note hedges (33,523)               $ (33,523)
Adjustments to Additional Paid in Capital, Warrant Issued 23,173   23,173            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 38,243     38,243          
Balance (in shares) at Dec. 31, 2017   109,764,000              
Balance at Dec. 31, 2017 571,584 $ 110 1,212,798 (636,227) (5,097)        
Increase (Decrease) in Stockholders' Equity                  
Net income (loss) (157,957) 0 0 (157,957) 0        
Foreign currency translation adjustment (4,447)       (4,447)        
Unrealized gain (loss) on marketable securities, net of tax (747) 0 0 0 (747)        
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan 4,630 $ 3 4,627 0 0        
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   2,616,000              
Stock Repurchased and Retired During Period, Shares   (3,786,000)              
Stock Repurchased and Retired During Period, Value (37,500) $ (4) (12,573) (37,456) 0        
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program (50,033)                
Stock-based compensation 21,736 $ 0 21,736 0 0        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | Accounting Standards Update 2016-01 1,058     1,058          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | Accounting Standards Update 2014-09 626,288     626,288          
Debt Conversion, Converted Instrument, Shares Issued   424,000              
Balance (in shares) at Dec. 31, 2018   109,018,000              
Balance at Dec. 31, 2018 1,012,112 $ 109 1,226,588 (204,294) (10,291)        
Increase (Decrease) in Stockholders' Equity                  
Net income (loss) (90,419) 0 0 (90,419) 0        
Foreign currency translation adjustment 10,145       10,145        
Unrealized gain (loss) on marketable securities, net of tax 54 0 0 0 54        
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan 8,081 $ 3 8,078 0 0        
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   3,113,000              
Stock-based compensation 26,476 $ 0 26,476 0 0        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | Accounting Standards Update 2016-02 4,469     4,469          
Balance (in shares) at Dec. 31, 2019   112,131,000              
Balance at Dec. 31, 2019 $ 970,918 $ 112 $ 1,261,142 $ (290,244) $ (92)