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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Paid-In Capital [Member] | Accumulated Comprehensive Income [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 21,467 | $ 615 | $ 977,962 | $ 8 | $ (957,118)
Balance (in shares) at Dec. 31, 2012 |  | 82,447 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options, contributions to 401(k) and incentive plans | 2,220 | $ 7 | 2,213 |  |
Exercise of stock options, contributions to 401(k) and incentive plans (in shares) |  | 933 |  |  |
Vesting of restricted stock units |  | $ 6 | (6) |  |
Vesting of restricted stock units (in shares) |  | 801 |  |  |
Stock-based compensation expense | 5,099 |  | 5,099 |  |
Sale of shares of common stock | 82,946 | $ 147 | 82,799 |  |
Sale of shares of common stock (in shares) |  | 19,661 |  |  |
Exercise of warrants | 8,348 | $ 12 | 8,336 |  |
Exercise of warrants (in shares) |  | 1,544 |  |  |
Net loss | (124,058) |  |  |  | (124,058)
Other comprehensive income (loss) | (9) |  |  | (9) |
Balance at Dec. 31, 2013 | (3,987) | $ 787 | 1,076,403 | (1) | (1,081,176)
Balance (in shares) at Dec. 31, 2013 |  | 105,386 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options, contributions to 401(k) and incentive plans | 4,526 | $ 11 | 4,515 |  |
Exercise of stock options, contributions to 401(k) and incentive plans (in shares) |  | 1,065 |  |  |
Vesting of restricted stock units |  | $ 7 | (7) |  |
Vesting of restricted stock units (in shares) |  | 981 |  |  |
Stock-based compensation expense | 10,772 |  | 10,772 |  |
Sale of shares of common stock | 37,786 | $ 61 | 37,725 |  |
Sale of shares of common stock (in shares) |  | 8,097 |  |  |
Issuance of warrants | (10,258) |  | (10,258) |  |
Exercise of warrants | 2,560 | $ 3 | 2,557 |  |
Exercise of warrants (in shares) |  | 363 |  |  |
Net loss | (38,301) |  |  |  | (38,301)
Other comprehensive income (loss) | 1 |  |  | $ 1 |
Balance at Dec. 31, 2014 | 3,099 | $ 869 | 1,121,707 |  | (1,119,477)
Balance (in shares) at Dec. 31, 2014 |  | 115,892 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of stock options, contributions to 401(k) and incentive plans | 1,467 | $ 4 | 1,463 |  |
Exercise of stock options, contributions to 401(k) and incentive plans (in shares) |  | 542 |  |  |
Vesting of restricted stock units |  | $ 9 | (9) |  |
Vesting of restricted stock units (in shares) |  | 1,202 |  |  |
Stock-based compensation expense | 9,727 |  | 9,727 |  |
Issuance of warrants | 450 |  | 450 |  |
Exercise of warrants | 3,554 | $ 11 | 3,543 |  |
Exercise of warrants (in shares) |  | 1,410 |  |  |
Net loss | (20,606) |  |  |  | (20,606)
Balance at Dec. 31, 2015 | $ (2,309) | $ 893 | $ 1,136,881 |  | $ (1,140,083)
Balance (in shares) at Dec. 31, 2015 |  | 119,046 |  |  |

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