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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