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Convertible Preferred Stock and Stock Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
--- | --- | ---
Feb. 07, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Warrants and Rights Note Disclosure [Abstract] |  |  |
Stock warrants exercised, shares | 1,277,250 |  |
Warrants exercised, price per share (in dollars per share) | $ 1.21 |  |
Proceeds from exercise of stock warrants | $ 1,500 | $ 0 | $ 1,545

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- Definition Common Stock Issued With Warrants Exercise, Exercise Price per Share + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of the conversion of convertible warrant securities. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
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- References No definition available. + Details
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