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Convertible Preferred Stock and Stock Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 07, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Warrants and Rights Note Disclosure [Abstract] |  |  |  |
Stock warrants exercised, shares | 1,277,250 | 0 | 1,277,250 | 267,000
Exercise price of the exercisable warrants (in dollars per share) |  |  | $ 1.21 |
Cash proceeds from exercise of warrants |  | $ 0 | $ 1,545 | $ 323

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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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