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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
--- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Adoption of ASU | ASU 2016-01 |  |  | $ (2,753) | $ 2,753 |  |
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 |
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 | [1]
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 |
[1] | The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.

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