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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Total
Balances at Dec. 31, 2017 $ 211 $ 3,627,433 $ (7,010) $ (1,990,005) $ 1,630,629
Increase (Decrease) in Stockholders' Equity          
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units 1 2,575     2,576
Issuance of shares of Common Stock for services rendered   87     87
Issuance of shares of Common Stock upon conversion of Convertible Senior Notes   27     27
Stock compensation   36,224     36,224
Other comprehensive income (loss)     (359)   (359)
Net income (loss)       (41,140) (41,140)
Balances at Mar. 31, 2018 212 3,666,346 (10,122) (2,028,392) 1,628,044
Balances at Dec. 31, 2017 211 3,627,433 (7,010) (1,990,005) 1,630,629
Increase (Decrease) in Stockholders' Equity          
Other comprehensive income (loss)         241
Net income (loss)         40,430
Balances at Sep. 30, 2018 213 3,759,030 (9,522) (1,946,822) 1,802,899
Increase (Decrease) in Stockholders' Equity          
Adoption of ASU | ASU 2016-01     (2,753) 2,753  
Balances at Mar. 31, 2018 212 3,666,346 (10,122) (2,028,392) 1,628,044
Increase (Decrease) in Stockholders' Equity          
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units   15,480     15,480
Issuance of shares of Common Stock for services rendered   85     85
Issuance of shares of Common Stock upon conversion of Convertible Senior Notes   2     2
Stock compensation   36,605     36,605
Other comprehensive income (loss)     313   313
Net income (loss)       52,394 52,394
Balances at Jun. 30, 2018 212 3,718,518 (9,809) (1,975,998) 1,732,923
Increase (Decrease) in Stockholders' Equity          
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units 1 2,423     2,424
Issuance of shares of Common Stock for services rendered   86     86
Issuance of shares of Common Stock upon conversion of Convertible Senior Notes   2     2
Stock compensation   38,001     38,001
Other comprehensive income (loss)     287   287
Net income (loss)       29,176 29,176
Balances at Sep. 30, 2018 213 3,759,030 (9,522) (1,946,822) 1,802,899
Increase (Decrease) in Stockholders' Equity          
Adoption of ASU | ASU No. 2016-02       95 95
Balances at Dec. 31, 2018 213 3,813,678 (10,165) (1,877,759) 1,925,967
Increase (Decrease) in Stockholders' Equity          
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units 1 15,480     15,481
Issuance of shares of Common Stock for services rendered   104     104
Stock compensation   40,690     40,690
Other comprehensive income (loss)     918   918
Net income (loss)       102,312 102,312
Balances at Mar. 31, 2019 214 3,869,952 (9,247) (1,775,352) 2,085,567
Balances at Dec. 31, 2018 213 3,813,678 (10,165) (1,877,759) 1,925,967
Increase (Decrease) in Stockholders' Equity          
Other comprehensive income (loss)         1,551
Net income (loss)         335,901
Balances at Sep. 30, 2019 215 3,972,689 (8,614) (1,541,763) 2,422,527
Balances at Mar. 31, 2019 214 3,869,952 (9,247) (1,775,352) 2,085,567
Increase (Decrease) in Stockholders' Equity          
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units 1 15,190     15,191
Issuance of shares of Common Stock for services rendered   123     123
Stock compensation   40,710     40,710
Other comprehensive income (loss)     282   282
Net income (loss)       105,318 105,318
Balances at Jun. 30, 2019 215 3,925,975 (8,965) (1,670,034) 2,247,191
Increase (Decrease) in Stockholders' Equity          
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units   3,111     3,111
Issuance of shares of Common Stock for services rendered   129     129
Stock compensation   43,474     43,474
Other comprehensive income (loss)     351   351
Net income (loss)       128,271 128,271
Balances at Sep. 30, 2019 $ 215 $ 3,972,689 $ (8,614) $ (1,541,763) $ 2,422,527