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Fair Value Measurements - Warrant Liabilities - Fair Value Assumptions (Details) - Warrant Liabilities [Member] | 6 Months Ended | 12 Months Ended
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Jun. 30, 2016 | Dec. 31, 2015
Minimum [Member] |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Expected volatility | 78.00% | 166.00%
Risk-free interest rate | 0.28% | 0.64%
Expected term | 5 months 9 days | 11 months 9 days
Maximum [Member] |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Expected volatility | 100.00% | 183.00%
Risk-free interest rate | 0.41% | 0.74%
Expected term | 8 months 9 days | 1 year 2 months 9 days

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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=66048111&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + 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=66048111&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + 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=66048111&loc=d3e19207-110258 + Details
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