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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Change in Fair Value of Warrant and Derivative Liabilities) (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($)
Derivatives And Fair Value [Line Items] |
Balance, Series B Redeemable Preferred Stock | $ 1,493,000
Dilutive Financing Derivative Liability [Member] |
Derivatives And Fair Value [Line Items] |
Balance, derivative liability |
Creation of derivative or warrant liability | 2,282,000
Changes in estimated fair value | (611,000)
Payout from liability | (1,545,000)
Balance, derivative liability | 126,000
November 2016 Warrant Derivative Liability [Member] |
Derivatives And Fair Value [Line Items] |
Balance, warrant liability |
Creation of derivative or warrant liability | 2,929,000
Changes in estimated fair value | (886,000)
Balance, warrant liability | 2,043,000
2011 Warrants [Member] |
Derivatives And Fair Value [Line Items] |
Balance, warrant liability | 6,000
Creation of derivative or warrant liability |
Changes in estimated fair value | (6,000)
Balance, warrant liability |
June 2016 Offering Warrants [Member] |
Derivatives And Fair Value [Line Items] |
Balance, warrant liability |
Creation of derivative or warrant liability | 1,816,000
Changes in estimated fair value | (1,542,000)
Balance, warrant liability | 274,000
Series B redeemable convertible preferred stock [Member] |
Derivatives And Fair Value [Line Items] |
Balance, Series B Redeemable Preferred Stock | 1,493,000
Changes in estimated fair value | $ (1,493,000)

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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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 + Details
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