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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 64,701 | $ 312 | $ 117,941 | $ 41 | $ (53,593)
Balance (in shares) at Dec. 31, 2009 |  | 31,224 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards | 2,191 | 10 | 2,181 |  |
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards (in shares) |  | 1,046 |  |  |
Issuance of common stock, net of costs of $46 | 19,966 | 50 | 19,916 |  |
Issuance of common stock, net of costs (in shares) |  | 4,955 |  |  |
Stock-based compensation | 3,298 |  | 3,298 |  |
Other comprehensive loss-change in unrealized gain (loss) on available-for-sale investments | (37) |  |  | (37) |
Net income (loss) | (23,062) |  |  |  | (23,062)
Balance at Dec. 31, 2010 | 67,057 | 372 | 143,336 | 4 | (76,655)
Balance (in shares) at Dec. 31, 2010 |  | 37,225 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards | 3,403 | 12 | 3,391 |  |
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards (in shares) |  | 1,198 |  |  |
Stock-based compensation | 3,780 |  | 3,780 |  |
Other comprehensive loss-change in unrealized gain (loss) on available-for-sale investments | (3) |  |  | (3) |
Net income (loss) | 11,256 |  |  |  | 11,256
Balance at Dec. 31, 2011 | 85,493 | 384 | 150,507 | 1 | (65,399)
Balance (in shares) at Dec. 31, 2011 | 38,423 | 38,423 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards | 3,646 | 19 | 3,627 |  |
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards (in shares) |  | 1,881 |  |  |
Repurchase of common stock | (828) | (2) | (826) |  |
Repurchase of common stock (in shares) |  | (250) |  |  |
Stock-based compensation | 3,835 |  | 3,835 |  |
Other comprehensive loss-change in unrealized gain (loss) on available-for-sale investments | 10 |  |  | 10 |
Net income (loss) | (27,614) |  |  |  | (27,614)
Balance at Dec. 31, 2012 | $ 64,542 | $ 401 | $ 157,143 | $ 11 | $ (93,013)
Balance (in shares) at Dec. 31, 2012 | 40,054 | 40,054 |  |  |

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