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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

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