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Statements of Stockholders' Equity (USD $) In Thousands | Common Stock | Additional Paid-In Capital | Retained Earnings / Accumulated Deficit | Total
--- | --- | --- | --- | ---
Beginning BALANCE, value at Dec. 31, 2009 | $ 394 | $ 147,481 | $ (141,079) | $ 6,796
Beginning BALANCE, shares at Dec. 31, 2009 | 39,395 |  |  |
Net loss |  |  | (7,346) | (7,346)
Common stock and warrants issued in private placement, net of issuance costs, value |  | 40 |  | 40
Fair value of stock-based compensation for restricted stock awards issued/(cancelled) to directors, shares | 661 |  |  |
Fair value of stock-based compensation for restricted stock awards issued/(cancelled) to directors, value | 7 | 378 |  | 385
Common stock issued upon exercise of stock options, shares | 38 |  |  |
Common stock issued upon exercise of stock options, value |  | 47 |  | 47
Common stock issued to employees under ESPP, shares | 49 |  |  |
Common stock issued to employees under ESPP, value |  | 30 |  | 30
Stock-based compensation expense related to stock options and ESPP |  | 1,364 |  | 1,364
Ending BALANCE, value at Dec. 31, 2010 | 401 | 149,340 | (148,425) | 1,316
Ending BALANCE, shares at Dec. 31, 2010 | 40,143 |  |  |
Net loss |  |  | (11,814) | (11,814)
Common stock and warrants issued in private placement, net of issuance costs, shares | 160,000 |  |  |
Common stock and warrants issued in private placement, net of issuance costs, value | 1,600 | 21,172 |  | 22,772
Conversion benefit included in convertible notes issued |  | 1,573 |  | 1,573
Fair value of stock-based compensation for restricted stock awards issued/(cancelled) to directors, shares | (175) |  |  |
Fair value of stock-based compensation for restricted stock awards issued/(cancelled) to directors, value |  | 98 |  | 98
Common stock issued upon exercise of stock options, shares |  |  |  |
Common stock issued to employees under ESPP, shares | 78 |  |  |
Common stock issued to employees under ESPP, value | 1 | 15 |  | 16
Stock-based compensation expense related to stock options and ESPP |  | 1,761 |  | 1,761
Fair value of warrants issued to non-employee |  | 30 |  | 30
Ending BALANCE, value at Dec. 31, 2011 | 2,002 | 173,989 | (160,239) | 15,752
Ending BALANCE, shares at Dec. 31, 2011 | 200,046 |  |  |
Net loss |  |  | (23,348) | (23,348)
Common stock and warrants issued in private placement, net of issuance costs, shares | 102,000 |  |  |
Common stock and warrants issued in private placement, net of issuance costs, value | 1,020 | 49,472 |  | 50,492
Conversion benefit included in convertible notes issued |  | 3,168 |  | 3,168
Common stock issued upon exercise of stock options, shares |  |  |  |
Common stock issued to employees under ESPP, shares | 85 |  |  |
Common stock issued to employees under ESPP, value | 1 | 21 |  | 22
Warrant exercise, shares | 101 |  |  |
Warrant exercise, value | 1 | (1) |  |
Stock-based compensation expense related to stock options and ESPP |  | 5,552 |  | 5,552
Fair value of warrants issued to non-employee |  | 180 |  | 180
Ending BALANCE, value at Dec. 31, 2012 | $ 3,024 | $ 232,381 | $ (183,587) | $ 51,818
Ending BALANCE, shares at Dec. 31, 2012 | 302,232 |  |  |

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