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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Derivatives And Fair Value [Line Items] |
Financial Liabilities Measured at Fair Value | The following fair value hierarchy table presents information about each major category of the Company's financial liabilities measured at fair value on a recurring basis: ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Quoted Prices in |  |  |  |  |  |  |  |  |
﻿ |  | Active Markets |  | Significant Other |  | Significant |  |  |
﻿ |  | for Identical |  | Observable Inputs |  | Unobservable |  |  |
﻿ |  | Items (Level 1) |  | (Level 2) |  | Inputs (Level 3) |  | Total
﻿December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |
﻿June 2016 offering warrant liability |  | $ | - |  | $ | - |  | $ | 274,000 |  | $ | 274,000
﻿Dilutive financing derivative liability |  |  | - |  |  | - |  |  | 126,000 |  |  | 126,000
﻿November 2016 offering warrant liability |  |  | - |  |  | - |  |  | 2,043,000 |  |  | 2,043,000
﻿Total liabilities |  | $ | - |  | $ | - |  | $ | 2,443,000 |  | $ | 2,443,000
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |
﻿Series B preferred stock derivative liability |  | $ | - |  | $ | - |  | $ | 1,493,000 |  | $ | 1,493,000
﻿2011 Warrant liability |  |  | - |  |  | - |  |  | 6,000 |  |  | 6,000
﻿Total liabilities |  | $ | - |  | $ | - |  | $ | 1,499,000 |  | $ | 1,499,000
﻿
Changes in Fair Value of Derivative and Warrant Liability | The following table sets forth a summary of changes in the fair value of the Company's Series B redeemable convertible preferred stock derivative, warrant liabilities and dilutive financing liability, which represents a recurring measurement that is classified within Level 3 of the fair value hierarchy, wherein fair value is estimated using significant unobservable inputs. ﻿ ﻿ ﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  | Series B Preferred |  | Dilutive Financing |  |
﻿ |  | 2011 Warrant |  | June 2016 Offering |  | Stock Derivative |  | Derivative |  | November 2016 Offering
﻿ |  | Liability |  | Warrant Liability |  | Liability |  | Liability |  | Warrant Liability
﻿Balance, December 31, 2015 |  | $ | 6,000 |  | $ | - |  | $ | 1,493,000 |  | $ | - |  | $ | -
﻿Creation of derivative or warrant liability |  |  | - |  |  | 1,816,000 |  |  | - |  |  | 2,282,000 |  |  | 2,929,000
﻿Changes in estimated fair value |  |  | (6,000) |  |  | (1,542,000) |  |  | (1,493,000) |  |  | (611,000) |  |  | (886,000)
﻿Payout from liability |  |  | - |  |  | - |  |  | - |  |  | (1,545,000) |  |  | -
﻿Balance, December 31, 2016 |  | $ | - |  | $ | 274,000 |  | $ | - |  | $ | 126,000 |  | $ | 2,043,000
﻿
Dilutive Financing Derivative Liability [Member] |
Derivatives And Fair Value [Line Items] |
Valuation Assumptions Used | The following assumptions were used to value the dilutive financing derivative liability from the inception date of April 8, 2016 through September 30, 2016: ﻿ ﻿
﻿ |  |  |  |  |
﻿ |  |  |  |  |
Volatility |  |  |  | 108 to 121 | %
Expected term (years), weighted average |  |  |  | 1.75 to 2.23 |
Risk-free interest rate |  |  |  | 0.58 to 0.79 | %
Dividend yield |  |  |  | 0.00 | %
Stock price dilutive limit |  |  |  | $2.35 to $4.05 |
Common stock closing price |  |  |  | $1.52 to $3.68 |
﻿
November 2016 Warrant Derivative Liability [Member] |
Derivatives And Fair Value [Line Items] |
Valuation Assumptions Used | The following assumptions were used on November 22, 2016 (issuance date) and December 31, 2016: ﻿
﻿ |  |  |  |  |  |  |  |
﻿ |  | December 31, 2016 |  | November 22, 2016
﻿Volatility |  |  | 112 | % |  |  | 116 | %
﻿Expected term (years) |  |  | 4.89 |  |  |  | 5.00 |
﻿Risk-free interest rate |  |  | 1.91 | % |  |  | 1.77 | %
﻿Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
﻿Exercise price |  |  | $0.75 |  |  |  | $0.75 |
﻿Common stock closing price |  |  | $0.44 |  |  |  | $0.62 |
﻿
Series B redeemable convertible preferred stock [Member] |
Derivatives And Fair Value [Line Items] |
Valuation Assumptions Used | The following assumptions were used at December 31, 2015: ﻿ ﻿
﻿ |  |  |  |
﻿ |  |  |  |
﻿ |  |
﻿Volatility |  |  | 108 to 117 | %
﻿Expected term (years), weighted average |  |  | 0.50 to 2.50 |
﻿Risk-free interest rate |  |  | 0.49 to 1.19 | %
﻿Dividend yield |  |  | 0.00 | %
﻿Exercise price |  |  | $7.00 |
﻿Common stock closing price |  |  | $3.98 |
﻿
June 2016 Offering Warrants [Member] |
Derivatives And Fair Value [Line Items] |
Valuation Assumptions Used | The following assumptions were used on June 3, 2016 (issuance date) and December 31, 2016: ﻿ ﻿
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  | December 31, 2016 |  | June 3, 2016
﻿Volatility |  |  | 118 | % |  |  | 123 | %
﻿Expected term (years) |  |  | 4.42 |  |  |  | 5.00 |
﻿Risk-free interest rate |  |  | 1.80 | % |  |  | 1.23 | %
﻿Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
﻿Exercise price |  |  | $2.25 |  |  |  | $2.25 |
﻿Common stock closing price |  |  | $0.44 |  |  |  | $2.06 |
﻿

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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