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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2015
Fair Value Inputs Liabilities Quantitative Information [Line Items] |
Schedule of Financial Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy | The following tables set forth the financial liabilities measured at fair value on a recurring basis by level within the fair value hierarchy at June 30, 2015 and December 31, 2014:
| Fair Value Measurements at June 30, 2015
Description | Level 1 |  | Level 2 |  | Level 3 |  | Total
Derivative liabilities |  |  |  |  |  |  |
Common stock warrants | $ | — |  |  | $ | — |  |  | 848 |  |  | $ | 848 |
Conversion feature of notes | — |  |  | — |  |  | 3,741 |  |  | 3,741 |
Total derivative liabilities | $ | — |  |  | $ | — |  |  | $ | 4,589 |  |  | $ | 4,589 |
| Fair Value Measurements at December 31, 2014
Description | Level 1 |  | Level 2 |  | Level 3 |  | Total
Derivative liabilities |  |  |  |  |  |  |
Common stock warrants | $ | — |  |  | $ | — |  |  | $ | 11,358 |  |  | $ | 11,358 |
Conversion feature of notes | — |  |  | — |  |  | 2,612 |  |  | 2,612 |
Total derivative liabilities | $ | — |  |  | $ | — |  |  | $ | 13,970 |  |  | $ | 13,970 |
Schedule of Reconciliation of Derivative Liability Measured At Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) | The following table presents a reconciliation of the derivative liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the six months ended June 30, 2015 and 2014:
| Common Stock Warrants |  | Preferred Stock Warrants |  | Conversion Feature of Notes |  | Total Derivative Liability
Balance at December 31, 2013 | $ | (199 | ) |  | $ | (11 | ) |  | $ | — |  |  | $ | (210 | )
Issuances of derivatives | (1,106 | ) |  | — |  |  | (848 | ) |  | $ | (1,954 | )
Reclassification from liability to equity | — |  |  | 5 |  |  | — |  |  | $ | 5 |
Change in fair value | (568 | ) |  | 6 |  |  | — |  |  | $ | (562 | )
Balance at June 30, 2014 | $ | (1,873 | ) |  | $ | — |  |  | $ | (848 | ) |  | $ | (2,721 | )
Balance at December 31, 2014 | $ | (11,358 | ) |  | $ | — |  |  | $ | (2,612 | ) |  | $ | (13,970 | )
Issuances of derivatives | — |  |  | — |  |  | — |  |  | $ | — |
Decrease in liability due to debt conversions | — |  |  | — |  |  | 179 |  |  | $ | 179 |
Decrease in liability due to warrants being exercised | 10,302 |  |  | — |  |  | — |  |  | $ | 10,302 |
Change in fair value | 208 |  |  | — |  |  | (1,308 | ) |  | $ | (1,100 | )
Balance at June 30, 2015 | $ | (848 | ) |  | $ | — |  |  | $ | (3,741 | ) |  | $ | (4,589 | )
Convertible Notes Payable |
Fair Value Inputs Liabilities Quantitative Information [Line Items] |
Schedule of Assumptions used in Estimating Fair Value | The assumptions used in estimating the conversion feature of the notes at June 30, 2015 and December 31, 2014 were as follows:
| June 30, 2015 |  | December 31, 2014
Estimated fair value of common share | $ | 0.57 |  |  | $ | 0.80 |
Weighted-average risk free interest rate | 0.28 | % |  | 0.67 | %
Weighted-average expected life | 1 year, 1 month |  |  | 1 year, 7 months |
Expected dividend yield | — | % |  | — | %
Weighted average expected volatility | 152 | % |  | 32 | %
Common Stock |
Fair Value Inputs Liabilities Quantitative Information [Line Items] |
Schedule of Assumptions used in Estimating Fair Value | The assumptions used in estimating the common stock warrant liability at June 30, 2015 and December 31, 2014 were as follows:
| June 30, 2015 |  | December 31, 2014
Fair value of common share | $ | 0.57 |  |  | $ | 0.80 |
Weighted-average risk free interest rate | 1.01 | % |  | 1.53 | %
Weighted-average expected life | 4 years, 2 months |  |  | 4 years, 7 months |
Expected dividend yield | — | % |  | — | %
Weighted average expected volatility | 44 | % |  | 116 | %

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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of liabilities. This disclosure may include, but is not limited to, the fair value of the liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + 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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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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