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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) | Redeemable Convertible Preferred Stock Series B [Member] Series B redeemable convertible preferred stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2013 | $ 707,000 | $ 36,000 | $ 362,454,000 | $ (385,115,000) | $ (22,625,000)
Balances (in shares) at Dec. 31, 2013 | 8,859,978 | 3,650,711 |  |  |
Net income (loss) |  |  |  | 23,109,000 | 23,109,000
Accretion of dividends on Series B redeemable convertible preferred stock | $ 1,285,000 |  | (1,285,000) |  | (1,285,000)
Warrants exercised |  | $ 1,000 | 1,594,000 |  | 1,595,000
Warrants exercised (in shares) |  | 54,683 |  |  |
Conversion of Series B redeemable convertible preferred stock to common stock, value | $ (2,000) | $ 1,000 | 706,000 |  | 707,000
Conversion of Series B redeemable convertible preferred stock to common stock, shares | (188,938) | 37,788 |  |  |
Stock-based compensation |  |  | 775,000 |  | 775,000
Stock-based compensation - severance |  |  | 1,161,000 |  | 1,161,000
Shares released from escrow |  | $ 2,000 | (2,000) |  |
Shares released from escrow (in shares) |  | 240,000 |  |  |
Balances at Dec. 31, 2014 | $ 1,990,000 | $ 40,000 | 365,403,000 | (362,006,000) | 3,437,000
Balances (in shares) at Dec. 31, 2014 | 8,671,040 | 3,983,182 |  |  |
Net income (loss) |  |  |  | (516,000) | (516,000)
Accretion of dividends on Series B redeemable convertible preferred stock | $ 1,307,000 |  | (1,307,000) |  | (1,307,000)
Amount reclassified to Series B redeemable convertible stock to accrete to its redemption value | 8,971,000 |  | (8,971,000) |  | (8,971,000)
Warrants exercised |  | $ 1,000 | 1,072,000 |  | 1,073,000
Warrants exercised (in shares) |  | 56,645 |  |  |
Conversion of Series B redeemable convertible preferred stock to common stock, value | $ (378,000) | $ 2,000 | 1,504,000 |  | 1,506,000
Conversion of Series B redeemable convertible preferred stock to common stock, shares | (1,143,187) | 228,637 |  |  |
Common stock issued in March 2015 financing, net of offering costs |  | $ 16,000 | 8,250,000 |  | 8,266,000
Common stock issued in March 2015 financing, net of offering costs (in shares) |  | 1,575,758 |  |  |
Warrants reclassified from liabilities to equity due to amendment of warrants |  |  | 5,462,000 |  | 5,462,000
Warrants reclassified from liabilities to equity due to increase in authorized shares |  |  | 3,281,000 |  | $ 3,281,000
Exercise of common stock options (shares) |  | 39,281 |  |  | 214,815
Stock-based compensation |  |  | 479,000 |  | $ 479,000
Stock-based compensation - severance |  |  | 4,000 |  | 4,000
Balances at Dec. 31, 2015 | $ 11,890,000 | $ 59,000 | $ 375,177,000 | $ (362,522,000) | $ 12,714,000
Balances (in shares) at Dec. 31, 2015 | 7,527,853 | 5,883,503 |  |  |

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