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Consolidated Statements of Changes in Stockholders Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Warrants | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2016 |  | 19,635 | 6,442 |  |
Beginning Balance at Dec. 31, 2016 | $ 512,917 | $ 20 | $ 88,381 | $ 758,498 | $ (333,982)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of stock awards, net of cancellations (in shares) |  | 1,583 |  |  |
Issuance of stock awards, net of cancellations | 0 | $ 2 |  | (2) |
Common stock issued for debt (in shares) |  | 14,328 |  |  |
Common stock issued for debt | 268,779 | $ 14 |  | 268,765 |
Common stock issued for general unsecured claims (in shares) |  | 104 |  |  |
Common stock issued for general unsecured claims | 0 |  |  |  |
Stock-based compensation | 17,912 |  |  | 17,912 |
Issuance of warrants for general unsecured claims (in shares) |  |  | 128 |  |
Issuance of warrants for general unsecured claims | 0 |  | $ 119 | (119) |
Cash paid for tax withholdings on vested stock awards | (6,730) |  |  | (6,730) |
Net (loss) income | 47,062 |  |  |  | 47,062
Ending Balance (in shares) at Dec. 31, 2017 |  | 35,650 | 6,570 |  |
Ending Balance at Dec. 31, 2017 | 839,940 | $ 36 | $ 88,500 | 1,038,324 | (286,920)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of stock awards, net of cancellations (in shares) |  | 9 |  |  |
Issuance of stock awards, net of cancellations | 0 |  |  |  |
Common stock issued for debt | 0 |  |  |  |
Common stock issued for general unsecured claims (in shares) |  | 28 |  |  |
Common stock issued for general unsecured claims | 0 |  |  |  |
Stock-based compensation | 24,276 |  |  | 24,276 |
Issuance of warrants for general unsecured claims (in shares) |  |  | 34 |  |
Issuance of warrants for general unsecured claims | 0 |  | $ 16 | (16) |
Cash paid for tax withholdings on vested stock awards | (7,420) |  |  | (7,420) |
Net (loss) income | $ (9,075) |  |  |  | (9,075)
Ending Balance (in shares) at Dec. 31, 2018 | 35,687 | 35,687 | 6,604 |  |
Ending Balance at Dec. 31, 2018 | $ 847,721 | $ 36 | $ 88,516 | 1,055,164 | (295,995)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of stock awards, net of cancellations (in shares) |  | 40 |  |  |
Issuance of stock awards, net of cancellations | 0 |  |  |  |
Common stock issued for debt | 0 |  |  |  |
Common stock issued for general unsecured claims (in shares) |  | 45 |  |  |
Common stock issued for general unsecured claims | 0 |  |  |  |
Stock-based compensation | 4,460 |  |  | 4,460 |
Issuance of warrants for general unsecured claims (in shares) |  |  | 55 |  |
Issuance of warrants for general unsecured claims | 0 |  | $ 4 | (4) |
Cash paid for tax withholdings on vested stock awards | (367) |  |  | (367) |
Net (loss) income | $ (449,305) |  |  |  | (449,305)
Ending Balance (in shares) at Dec. 31, 2019 | 35,772 | 35,772 | 6,659 |  |
Ending Balance at Dec. 31, 2019 | $ 402,452 | $ 36 | $ 88,520 | $ 1,059,253 | $ (745,357)

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