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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) | Total | Common Stock | Common Stock Warrants | Additional Paid-in Capital | Accumulated Earnings (Deficit)
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2013 | $ 952,005,000 | $ 4,768,000 |  | $ 499,888,000 | $ 447,349,000
Beginning Balance, Shares at Dec. 31, 2013 |  | 9,536,000 |  |  |
Stock-based compensation | 10,697,000 | $ 31,000 |  | 10,666,000 |
Stock-based compensation, Shares |  | 62,000 |  |  |
Tax withholdings related to equity awards | (2,349,000) | $ (13,000) |  | (2,336,000) |
Tax withholdings related to equity awards, Shares |  | (26,000) |  |  |
Taxes related to equity award vesting | (1,055,000) |  |  | (1,055,000) |
Repurchases of common stock | (8,086,000) | $ (100,000) |  | (7,986,000) |
Repurchases of common stock, Shares |  | (200,000) |  |  |
Net loss | (57,111,000) |  |  |  | (57,111,000)
Dividends paid | (23,829,000) |  |  |  | (23,829,000)
Ending Balance at Dec. 31, 2014 | 870,272,000 | $ 4,686,000 |  | 499,177,000 | 366,409,000
Ending Balance, Shares at Dec. 31, 2014 |  | 9,372,000 |  |  |
Stock-based compensation | 8,149,000 | $ 94,000 |  | 8,055,000 |
Stock-based compensation, Shares |  | 188,000 |  |  |
Tax withholdings related to equity awards | (526,000) | $ (8,000) |  | (518,000) |
Tax withholdings related to equity awards, Shares |  | (16,000) |  |  |
Taxes related to equity award vesting | (2,044,000) |  |  | (2,044,000) |
Net loss | (1,047,109,000) |  |  |  | (1,047,109,000)
Ending Balance at Dec. 31, 2015 | (171,258,000) | $ 4,772,000 |  | 504,670,000 | (680,700,000)
Ending Balance, Shares at Dec. 31, 2015 |  | 9,544,000 |  |  |
Stock-based compensation | 4,660,000 | $ 116,000 |  | 4,544,000 |
Stock-based compensation, Shares |  | 232,000 |  |  |
Tax withholdings related to equity awards | (313,000) | $ (20,000) |  | (293,000) |
Tax withholdings related to equity awards, Shares |  | (41,000) |  |  |
Taxes related to equity award vesting | 0 |  |  |  |
Common stock issued for debt conversion | 1,639,000 | $ 88,000 |  | 1,551,000 |
Common stock issued for debt conversion, Shares |  | 176,000 |  |  |
Common stock issued in exchange for debt | 13,603,000 | $ 1,385,000 |  | 12,218,000 |
Common stock issued in exchange for debt, Shares |  | 2,771,000 |  |  |
Common stock warrants issued | 15,623,000 |  | $ 15,623,000 |  |
Common stock warrants exercised | $ 13,000 | $ 628,000 | (9,951,000) | 9,336,000 |
Common stock warrants exercised, Shares | 1,255,462 | 1,256,000 |  |  |
Stock issuance costs | $ (102,000) |  |  | (102,000) |
Net loss | (135,134,000) |  |  |  | (135,134,000)
Ending Balance at Dec. 31, 2016 | $ (271,269,000) | $ 6,969,000 | $ 5,672,000 | $ 531,924,000 | $ (815,834,000)
Ending Balance, Shares at Dec. 31, 2016 |  | 13,938,000 |  |  |

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