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Sales of Common Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2012 | Jul. 31, 2008 | Jun. 30, 2013
Units issued in direct offering |  | 6,686,650 | 4,600,000
Equity issuance, price per share |  | $ 2.68 |
Proceeds from direct offering |  | $ 17,500 | $ 10,000
Common stock authorized for issuance under prior shelf registration statement with SEC, dollar amount | $ 50,000 |  |
Minimum [Member] |  |  |
Equity issuance, price per share |  |  | $ 2.06
Maximum [Member] |  |  |
Equity issuance, price per share |  |  | $ 2.63

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