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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Series B redeemable convertible preferred stock |  | $ | - |  | $ | - |  | $ | 1,493,000 |  | $ | 1,493,000
Warrant liability |  |  | - |  |  | - |  |  | 6,000 |  |  | 6,000
Total liabilities |  | $ | - |  | $ | - |  | $ | 1,499,000 |  | $ | 1,499,000
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Series B redeemable convertible preferred stock |  | $ | - |  | $ | - |  | $ | 12,320,000 |  | $ | 12,320,000
Warrant liability |  |  | - |  |  | - |  |  | 5,826,000 |  |  | 5,826,000
Total liabilities |  | $ | - |  | $ | - |  | $ | 18,146,000 |  | $ | 18,146,000
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 and warrant liabilities, 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
|  | Warrant |  | Redeemable
|  | Liability |  | Preferred Stock
Balance, December 31, 2014 |  | $ | 5,826,000 |  | $ | 12,320,000
Issuances |  |  | 4,210,000 |  |  | -
Exercises |  |  | (677,000) |  |  | -
Conversions to common stock |  |  | - |  |  | (1,497,000)
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) |  |  | (9,330,000)
Balance as of December 31, 2015 |  | $ | 6,000 |  | $ | 1,493,000
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 and December 31, 2014:
|  | December 31, 2015 |  | December 31, 2014
Volatility |  |  | 108 to 117 | % |  |  | 91 | %
Expected term (years), weighted average |  |  | 0.50 to 2.50 |  |  |  | 1.25 |
Risk-free interest rate |  |  | 0.49 to 1.19 | % |  |  | 0.36 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Exercise price |  | $ | 7.00 |  |  | $ | 7.00 |
Common stock closing price |  | $ | 3.98 |  |  | $ | 10.50 |
Warrant [Member] |
Derivatives And Fair Value [Line Items] |
Valuation Assumptions Used | The following assumptions were used at December 31, 2015 and December 31, 2014:
|  | December 31, 2015 |  | December 31, 2014
|  | Series (1) |  | Series (1)
|  |  |  |  |  |  |  |  |  | June |  | July |  | December
|  | 2011 |  | 2011 |  | 2013 |  | 2013 |  | 2013
Volatility |  |  | 112 | % |  |  | 155 | % |  |  | 155 | % |  |  | 155 | % |  |  | 151 | %
Expected term (years) |  |  | 0.98 |  |  |  | 1.98 |  |  |  | 3.49 |  |  |  | 3.54 |  |  |  | 3.98 |
Risk-free interest rate |  |  | 0.64 | % |  |  | 0.67 | % |  |  | 1.23 | % |  |  | 1.25 | % |  |  | 1.37 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Exercise price |  | $ | 23.00 |  |  | $ | 23.00 |  |  | $ | 7.00 |  |  | $ | 7.00 |  |  | $ | 12.50 |
Common stock closing price |  | $ | 3.98 |  |  | $ | 10.50 |  |  | $ | 10.50 |  |  | $ | 10.50 |  |  | $ | 10.50 |
| (1) | See Note 11 – Warrants below for further description of the respective series of warrants.

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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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