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Fair Value Measurements - Schedule of Fair Value of Warrants (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
October 2016 Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) | 142.46% | 95.03%
Risk-free interest rates (in hundredths) | 1.77% | 1.93%
Expected life (in years) | 4 years 7 days | 4 years 9 months 18 days
June 2016 Series C Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) |  | 94.19%
Risk-free interest rates (in hundredths) |  | 2.01%
Expected life (in years) |  | 5 years 6 months
July 2015 Series A Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) | 165.32% | 95.51%
Risk-free interest rates (in hundredths) | 1.59% | 1.59%
Expected life (in years) | 2 years 9 months 22 days | 3 years 7 months 6 days
February 2015 Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) | 181.24% | 95.52%
Risk-free interest rates (in hundredths) | 1.53% | 1.47%
Expected life (in years) | 2 years 4 months 17 days | 3 years 1 month 6 days
October 2013 Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) | 227.68% | 152.70%
Risk-free interest rates (in hundredths) | 1.33% | 1.20%
Expected life (in years) | 1 year 29 days | 1 year 9 months 18 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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