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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2015
Derivatives And Fair Value [Line Items] |
Schedule of Derivative Liabilities at Fair Value [Table Text Block] | 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 for Identical Items (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total |
March 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred B stock conversion liability |  | $ | — |  | $ | — |  | $ | 19,425,000 |  | $ | 19,425,000 |
Warrant liability |  |  | — |  |  | — |  |  | 14,727,000 |  |  | 14,727,000 |
Total liabilities |  | $ | — |  | $ | — |  | $ | 34,152,000 |  | $ | 34,152,000 |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred B stock conversion liability |  | $ | — |  | $ | — |  | $ | 12,320,000 |  | $ | 12,320,000 |
Warrant liability |  |  | — |  |  | — |  |  | 5,826,000 |  |  | 5,826,000 |
Total liabilities |  | $ | — |  | $ | — |  | $ | 18,146,000 |  | $ | 18,146,000 |
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] | 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 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:
|  | Warrant Liability |  | Preferred B Stock Conversion Liability |
Balance as of December 31, 2014 |  | $ | 5,826,000 |  | $ | 12,320,000 |
Issuance of warrants |  |  | 4,211,000 |  |  | — |
Changes in estimated fair value |  |  | 4,690,000 |  |  | 7,105,000 |
Balance as of March 31, 2015 |  | $ | 14,727,000 |  | $ | 19,425,000 |
Redeemable Convertible Preferred Stock [Member] |
Derivatives And Fair Value [Line Items] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] | The following assumptions were used at March 31, 2015 and December 31, 2014:
|  | March 31, 2015 |  |  | December 31, 2014 |
|  |  |  |  |  | June |  |  | July |  |  | December |  |  | March |  |  |  |  |  |  | June |  |  | July |  |  | December |
|  | 2011 |  |  | 2013 |  |  | 2013 |  |  | 2013 |  |  | 2015 |  |  | 2011 |  |  | 2013 |  |  | 2013 |  |  | 2013 |
Volatility |  |  | 105 | % |  |  | 141 | % |  |  | 141 | % |  |  | 152 | % |  |  | 141 | % |  |  | 155 | % |  |  | 155 | % |  |  | 155 | % |  |  | 151 | %
Expected term (years) |  |  | 1.73 |  |  |  | 3.24 |  |  |  | 3.29 |  |  |  | 3.73 |  |  |  | 4.96 |  |  |  | 1.98 |  |  |  | 3.49 |  |  |  | 3.54 |  |  |  | 3.98 |
Risk-free interest rate |  |  | 0.48 | % |  |  | 0.95 | % |  |  | 0.96 | % |  |  | 1.07 | % |  |  | 1.36 | % |  |  | 0.67 | % |  |  | 1.23 | % |  |  | 1.25 | % |  |  | 1.37 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Exercise price |  | $ | 0.46 |  |  | $ | 0.14 |  |  | $ | 0.14 |  |  | $ | 0.17 |  |  | $ | 0.215 |  |  | $ | 0.46 |  |  | $ | 0.14 |  |  | $ | 0.14 |  |  | $ | 0.25 |
Common stock closing price |  | $ | 0.30 |  |  | $ | 0.30 |  |  | $ | 0.30 |  |  | $ | 0.30 |  |  | $ | 0.30 |  |  | $ | 0.21 |  |  | $ | 0.21 |  |  | $ | 0.21 |  |  | $ | 0.21 |
Warrant [Member] |
Derivatives And Fair Value [Line Items] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] | The following assumptions were used at March 31, 2015 and December 31, 2014:
|  | March 31, 2015 |  |  | December 31, 2014 |
Volatility |  |  | 96 | % |  |  | 91 | %
Expected term (years) |  |  | 1.00 |  |  |  | 1.25 |
Risk-free interest rate |  |  | 0.26 | % |  |  | 0.36 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Exercise price |  | $ | 0.14 |  |  | $ | 0.14 |
Common stock closing price |  | $ | 0.30 |  |  | $ | 0.21 |

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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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