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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Change in Fair Value of Series B Convertible Stock) (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($)
Derivatives And Fair Value [Line Items] |
Balance, Warrant Liability | $ 5,826,000
Balance, Series B Redeemable Preferred Stock | 12,320,000
Balance, Warrant Liability | 6,000
Balance, Series B Redeemable Preferred Stock | 1,493,000
Series B redeemable convertible preferred stock [Member] |
Derivatives And Fair Value [Line Items] |
Balance, Series B Redeemable Preferred Stock | 12,320,000
Conversions to common stock | (1,497,000)
Changes in estimated fair value | (9,330,000)
Balance, Series B Redeemable Preferred Stock | 1,493,000
Warrant [Member] |
Derivatives And Fair Value [Line Items] |
Balance, Warrant Liability | 5,826,000
Issuance | 4,210,000
Exercises | (677,000)
Warrants reclassified from liabilities to equity due to amendment of warrants | (5,462,000)
Warrants reclassified from liabilities to equity due to increase in authorized shares | (3,281,000)
Changes in estimated fair value | (610,000)
Balance, Warrant Liability | $ 6,000

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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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