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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Fair Value of Financial Liabilities Measured on Recurring Basis) (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Preferred B stock conversion liability |  | $ 1,493,000
Total liabilities | $ 2,443,000 | 1,499,000
Dilutive Financing Derivative Liability [Member] |  |
Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Derivative liability | 126,000 |
November 2016 Warrant Derivative Liability [Member] |  |
Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Warrant liability | 2,043,000 |
June 2016 Offering Warrants [Member] |  |
Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Warrant liability | 274,000 |
2011 Warrants [Member] |  |
Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Warrant liability |  | 6,000
Fair Value, Inputs, Level 3 [Member] |  |
Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Preferred B stock conversion liability |  | 1,493,000
Total liabilities | 2,443,000 | 1,499,000
Fair Value, Inputs, Level 3 [Member] | Dilutive Financing Derivative Liability [Member] |  |
Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Derivative liability | 126,000 |
Fair Value, Inputs, Level 3 [Member] | November 2016 Warrant Derivative Liability [Member] |  |
Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Warrant liability | 2,043,000 |
Fair Value, Inputs, Level 3 [Member] | June 2016 Offering Warrants [Member] |  |
Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Warrant liability | $ 274,000 |
Fair Value, Inputs, Level 3 [Member] | 2011 Warrants [Member] |  |
Schedule Of Derivative Liabilities At Fair Value [Line Items] |  |
Warrant liability |  | $ 6,000

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- Definition Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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