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Fair Value Measurements - Schedule of Fair Value of Warrants (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) | 122.68% | 130.88%
Risk-free interest rates (in hundredths) | 1.95% | 1.68%
Expected life (in years) | 6 months 29 days | 9 months 25 days
Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) | 291.61% | 266.92%
Risk-free interest rates (in hundredths) | 2.63% | 2.06%
Expected life (in years) | 5 years 10 months 13 days | 4 years 10 months 17 days
November 2017 Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) |  | 217.39%
Risk-free interest rates (in hundredths) |  | 1.98%
Expected life (in years) |  | 4 years 10 months 17 days
October 2016 Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) |  | 130.88%
Risk-free interest rates (in hundredths) |  | 2.06%
Expected life (in years) |  | 3 years 9 months 3 days
July 2015 Series A Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) |  | 161.87%
Risk-free interest rates (in hundredths) |  | 1.94%
Expected life (in years) |  | 2 years 6 months 21 days
February 2015 Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) |  | 169.95%
Risk-free interest rates (in hundredths) |  | 1.90%
Expected life (in years) |  | 2 years 1 month 16 days
October 2013 Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Expected volatility (in hundredths) |  | 266.92%
Risk-free interest rates (in hundredths) |  | 1.68%
Expected life (in years) |  | 9 months 25 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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