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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Treasury Stock
Additional Paid-in Capital
2025 Notes
Additional Paid-in Capital
2027 Notes
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
2025 Notes
2027 Notes
Total
Balance at the beginning of the period at Dec. 31, 2017 $ 482 $ (1,284)     $ 1,051,953 $ (212,870) $ 1,812     $ 840,093
Balance (in shares) at Dec. 31, 2017 48,229 85                
Increase (Decrease) in Stockholders' Equity                    
Net loss           (407,088)       (407,088)
Other comprehensive income, net of tax             8     8
Share-based compensation expense         16,074         16,074
Net issuance under employee stock plans $ 3 $ 6,721     (6,702) (25)       (3)
Net issuance under employee stock plans (in shares) 318 (512)                
Purchases of common stock   $ (11,309)               (11,309)
Purchase of common stock (in shares)   950                
Balance at the end of the period at Dec. 31, 2018 $ 485 $ (5,872)     1,061,325 (619,983) 1,820     437,775
Balance (in shares) at Dec. 31, 2018 48,547 523                
Increase (Decrease) in Stockholders' Equity                    
Net loss           (78,733)       (78,733)
Other comprehensive income, net of tax             74     74
Share-based compensation expense         15,270         15,270
Net issuance under employee stock plans $ 5 $ 5,872     (5,537) (214)       126
Net issuance under employee stock plans (in shares) 447 (523)                
Balance at the end of the period at Dec. 31, 2019 $ 490       1,071,058 (698,930) 1,894     374,512
Balance (in shares) at Dec. 31, 2019 48,994                  
Increase (Decrease) in Stockholders' Equity                    
Net loss           (8,391)       (8,391)
Other comprehensive income, net of tax             (48)     (48)
Share-based compensation expense         12,703         12,703
Net issuance under employee stock plans $ 7       549         556
Net issuance under employee stock plans (in shares) 730                  
Extinguishment of equity component of repurchased/exchanged 2023 Notes         (14,714)         (14,714)
Equity component of Notes     $ 20,706 $ 33,363       $ 20,706 $ 33,363  
Purchase of capped calls         (10,313)         (10,313)
Balance at the end of the period at Dec. 31, 2020 $ 497       $ 1,113,352 $ (707,321) $ 1,846     $ 408,374
Balance (in shares) at Dec. 31, 2020 49,724