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Consolidated Statements Of Stockholders' Deficit - USD ($) $ in Thousands | Total | Series A Preferred Stock | Preferred Shares | Preferred Shares Series A Preferred Stock | Common Shares | Treasury Stock | Additional Paid-in Capital | Additional Paid-in Capital Series A Preferred Stock | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2012 |  |  |  |  | 150,360,933 | (20,079) |  |  |
Beginning Balance at Dec. 31, 2012 | $ (3,997) |  |  |  | $ 124,597 | $ (217) | $ 619,266 |  | $ (747,643)
Exercise of warrants (in shares) |  |  |  |  | 147,050 |  |  |  |
Exercise of warrants | 160 |  |  |  | $ 113 |  | 47 |  |
Exercise of stock options (in shares) |  |  |  |  | 386,000 |  |  |  |
Exercise of stock options | 627 |  |  |  | $ 292 |  | 335 |  |
Issuance of shares (in shares) |  |  |  |  | 21,700,000 |  |  |  |
Issuance of shares | 121,206 |  |  |  | $ 16,401 |  | 104,805 |  |
Vesting of restricted stock units (in shares) |  |  |  |  | 93,048 |  |  |  |
Vesting of restricted stock units |  |  |  |  | $ 71 |  | (71) |  |
Tax provision on stock-based compensation | (361) |  |  |  |  |  | (361) |  |
Transfer of fair value of warrants exercised from liabilities to equity | 24 |  |  |  |  |  | 24 |  |
Share issuances for services (in shares) |  |  |  |  | 4,032 |  |  |  |
Share issuances for services | 27 |  |  |  | $ 3 |  | 24 |  |
Stock-based compensation | 14,685 |  |  |  |  |  | 14,685 |  |
Net loss | (166,227) |  |  |  |  |  |  |  | (166,227)
Ending Balance (in shares) at Dec. 31, 2013 |  |  |  |  | 172,691,063 | (20,079) |  |  |
Ending Balance at Dec. 31, 2013 | $ (33,856) |  |  |  | $ 141,477 | $ (217) | 738,754 |  | (913,870)
Exercise of warrants (in shares) | 1,684,888 |  |  |  | 1,684,888 |  |  |  |
Exercise of warrants | $ 1,651 |  |  |  | $ 1,443 |  | 208 |  |
Exercise of stock options (in shares) | 234,500 |  |  |  | 234,500 |  |  |  |
Exercise of stock options | $ 307 |  |  |  | $ 193 |  | 114 |  |
Reacquisition of conversion option in convertible notes | (10,100) |  |  |  |  |  | (10,100) |  |
Tax provision on stock-based compensation | (2,299) |  |  |  |  |  | (2,299) |  |
Stock-based compensation | 9,022 |  |  |  |  |  | 9,022 |  |
Refund of equity issuance costs | 3,191 |  |  |  |  |  | 3,191 |  |
Net loss | (56,364) |  |  |  |  |  |  |  | (56,364)
Ending Balance (in shares) at Dec. 31, 2014 |  |  |  |  | 174,610,451 | (20,079) |  |  |
Ending Balance at Dec. 31, 2014 | (88,448) |  |  |  | $ 143,113 | $ (217) | 738,890 |  | (970,234)
Conversion of Series A Convertible Preferred Stock, net (in shares) |  |  | (62,833,330) |  | 6,283,333 |  |  |  |
Conversion of Series A Convertible Preferred Stock, net | (187) |  | $ (4,804) |  | $ 4,804 |  | (187) |  |
Preferred stock purchase option | $ 946 |  |  |  |  |  | 1,814 |  | (868)
Preferred stock beneficial conversion features |  |  |  |  |  |  | 32,987 |  | (32,987)
Exercise of warrants (in shares) | 1,844,585 |  |  |  | 1,844,585 |  |  |  |
Exercise of warrants | $ 2,713 |  |  |  | $ 1,429 |  | 1,284 |  |
Exercise of stock options (in shares) | 18,020 |  |  |  | 18,020 |  |  |  |
Exercise of stock options | $ 31 |  |  |  | $ 13 |  | 18 |  |
Issuance of shares (in shares) |  |  |  | 391,017,970 |  |  |  |  |
Issuance of shares |  | $ 57,853 |  | $ 29,168 |  |  |  | $ 28,685 |
Vesting of restricted stock units (in shares) |  |  |  |  | 821,376 | (154,423) |  |  |
Vesting of restricted stock units | (194) |  |  |  | $ 619 | $ (194) | (619) |  |
Reacquisition of conversion option in convertible notes | (1,300) |  |  |  |  |  | (1,300) |  |
Tax benefits realized from stock-based compensation | 727 |  |  |  |  |  | 727 |  |
Stock-based compensation | 13,872 |  |  |  |  |  | 13,872 |  |
Net loss | (115,204) |  |  |  |  |  |  |  | (115,204)
Ending Balance (in shares) at Dec. 31, 2015 |  |  | 328,184,640 |  | 183,577,765 | (174,502) |  |  |
Ending Balance at Dec. 31, 2015 | $ (129,191) |  | $ 24,364 |  | $ 149,978 | $ (411) | $ 816,171 |  | $ (1,119,293)

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