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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Warrants | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  | 35,650,000 | 6,570,000 |  |
Beginning 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) |  | (90,000) |  |  |
Stock-based compensation | 16,055 |  |  | 16,055 |
Cash paid for tax withholdings on vested stock awards | (1,661) |  |  | (1,661) |
Net loss | (40,894) |  |  |  | (40,894)
Ending balance (in shares) at Mar. 31, 2018 |  | 35,560,000 | 6,570,000 |  |
Ending balance at Mar. 31, 2018 | 813,440 | $ 36 | $ 88,500 | 1,052,718 | (327,814)
Beginning balance (in shares) at Dec. 31, 2017 |  | 35,650,000 | 6,570,000 |  |
Beginning balance at Dec. 31, 2017 | 839,940 | $ 36 | $ 88,500 | 1,038,324 | (286,920)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss | (74,968) |  |  |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 35,332,000 | 6,622,000 |  |
Ending balance at Jun. 30, 2018 | 780,256 | $ 35 | $ 88,514 | 1,053,595 | (361,888)
Beginning balance (in shares) at Mar. 31, 2018 |  | 35,560,000 | 6,570,000 |  |
Beginning balance at Mar. 31, 2018 | 813,440 | $ 36 | $ 88,500 | 1,052,718 | (327,814)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of stock awards, net of cancellations (in shares) |  | (254,000) |  |  |
Issuance of stock awards, net of cancellations | 0 | $ (1) |  | 1 |
Common stock issued for general unsecured claims |  | 26,000 |  |  |
Stock-based compensation | 6,605 |  |  | 6,605 |
Issuance of warrants for general unsecured claims (in shares) |  |  | 52,000 |  |
Issuance of warrants for general unsecured claims | 0 |  | $ 14 | (14) |
Cash paid for tax withholdings on vested stock awards | (5,715) |  |  | (5,715) |
Net loss | (34,074) |  |  |  | (34,074)
Ending balance (in shares) at Jun. 30, 2018 |  | 35,332,000 | 6,622,000 |  |
Ending balance at Jun. 30, 2018 | $ 780,256 | $ 35 | $ 88,514 | 1,053,595 | (361,888)
Beginning balance (in shares) at Dec. 31, 2018 | 35,687,000 | 35,687,000 | 6,604,000 |  |
Beginning balance at Dec. 31, 2018 | $ 847,721 | $ 36 | $ 88,516 | 1,055,164 | (295,995)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Stock-based compensation | 1,073 |  |  | 1,073 |
Issuance of warrants for general unsecured claims (in shares) |  |  | 1,000 |  |
Issuance of warrants for general unsecured claims | 0 |  | $ 2 | (2) |
Net loss | (5,277) |  |  |  | (5,277)
Ending balance (in shares) at Mar. 31, 2019 |  | 35,687,000 | 6,605,000 |  |
Ending balance at Mar. 31, 2019 | $ 843,460 | $ 36 | $ 88,518 | 1,056,235 | (301,329)
Beginning balance (in shares) at Dec. 31, 2018 | 35,687,000 | 35,687,000 | 6,604,000 |  |
Beginning balance at Dec. 31, 2018 | $ 847,721 | $ 36 | $ 88,516 | 1,055,164 | (295,995)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss | $ (18,561) |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 | 35,762,000 | 35,762,000 | 6,605,000 |  |
Ending balance at Jun. 30, 2019 | $ 832,141 | $ 36 | $ 88,518 | 1,058,200 | (314,613)
Beginning balance (in shares) at Mar. 31, 2019 |  | 35,687,000 | 6,605,000 |  |
Beginning balance at Mar. 31, 2019 | 843,460 | $ 36 | $ 88,518 | 1,056,235 | (301,329)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of stock awards, net of cancellations (in shares) |  | 75,000 |  |  |
Stock-based compensation | 2,170 |  |  | 2,170 |
Cash paid for tax withholdings on vested stock awards | (205) |  |  | (205) |
Net loss | $ (13,284) |  |  |  | (13,284)
Ending balance (in shares) at Jun. 30, 2019 | 35,762,000 | 35,762,000 | 6,605,000 |  |
Ending balance at Jun. 30, 2019 | $ 832,141 | $ 36 | $ 88,518 | $ 1,058,200 | $ (314,613)

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