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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Convertible Senior Notes 1.25 Percent Due 2020
Common Stock
Convertible Senior Notes 0.375 Percent Due 2018
Common Stock
Additional Paid-in Capital
Convertible Senior Notes 1.25 Percent Due 2020
Additional Paid-in Capital
Convertible Senior Notes 0.375 Percent Due 2018
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Convertible Senior Notes 1.25 Percent Due 2020
Convertible Senior Notes 0.375 Percent Due 2018
Total
Balances at Dec. 31, 2016     $ 189     $ 2,096,929 $ (2,886) $ (1,674,765)     $ 419,467
Increase (Decrease) in Stockholders' Equity                      
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units and shares of Common Stock under the ESPP     3     66,732         66,735
Issuance of shares of Common Stock upon conversion of Convertible Senior Notes $ 7 $ 7   $ 330,004 $ 351,037       $ 330,011 $ 351,044  
Issuance of shares of Common Stock for services rendered           294         294
Issuance of shares of Common Stock     5     649,382         649,387
Stock compensation           133,055         133,055
Other comprehensive loss             (4,124)       (4,124)
Net income (loss)               (313,142)     (313,142)
Balances at Dec. 31, 2017     211     3,627,433 (7,010) (1,990,005)     1,630,629
Increase (Decrease) in Stockholders' Equity                      
Adoption of ASU | ASU 2016-16               (2,098)     (2,098)
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units and shares of Common Stock under the ESPP     2     29,940         29,942
Issuance of shares of Common Stock upon conversion of Convertible Senior Notes         $ 7,695         $ 7,695  
Issuance of shares of Common Stock for services rendered           344         344
Stock compensation           148,266         148,266
Other comprehensive loss             (402)       (402)
Net income (loss)               109,493     109,493
Balances at Dec. 31, 2018     213     3,813,678 (10,165) (1,877,759)     1,925,967
Increase (Decrease) in Stockholders' Equity                      
Adoption of ASU | ASU 2016-01             (2,753) 2,753      
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units and shares of Common Stock under the ESPP     3     63,296         63,299
Issuance of shares of Common Stock for services rendered           487         487
Stock compensation           167,029         167,029
Other comprehensive loss             (5,377)       (5,377)
Net income (loss)               446,906     446,906
Balances at Dec. 31, 2019     $ 216     $ 4,044,490 $ (15,542) (1,430,758)     2,598,406
Increase (Decrease) in Stockholders' Equity                      
Adoption of ASU | ASU 2016-02               $ 95     $ 95