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CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIT (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands | Total | Common Stock | Common Stock Warrants | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ (369,272) | $ 7,714 | $ 3,557 | $ 546,696 | $ (927,239)
Beginning Balance, Shares at Dec. 31, 2017 |  | 15,428,000 |  |  |
Stock-based compensation | 3,109 | $ 261 |  | 2,848 |
Stock-based compensation, Shares |  | 523,000 |  |  |
Income tax withholdings related to equity awards | $ (369) | $ (26) |  | (343) |
Income tax withholdings related to equity awards, Shares |  | (53,000) |  |  |
Common stock warrants exercised |  | $ 182 | (3,116) | 2,934 |
Common stock warrants exercised, Shares | 363,638 | 363,000 |  |  |
Net loss | $ (75,889) |  |  |  | (75,889)
Ending Balance at Jun. 30, 2018 | $ (442,421) | $ 8,131 | $ 441 | $ 552,135 | $ (1,003,128)
Ending Balance, Shares at Jun. 30, 2018 |  | 16,261,000 |  |  |

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