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Fair Value Measurements - Common Stock Warrants (Details) - $ / shares | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Historical volatilities period | 7 years |
Fair value of common stock warrants (in usd per share) | $ 13.04 | $ 23.47
Employee Stock Option |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Common stock warrants outstanding (in shares) | 354,350 | 345,135

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- Definition Number 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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