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Fair Value Measurements - Schedule of Fair Value of Warrants (Detail) | Jun. 30, 2018 | Dec. 31, 2017
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'Expected Volatility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input | 1.9410 |
Risk-free Interest Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input | 0.0278 |
Expected Life [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants term | 5 years |
Minimum [Member] | 'Expected Volatility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input | 1.3269 | 1.3088
Minimum [Member] | Risk-free Interest Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input | 0.0199 | 0.0168
Minimum [Member] | Expected Life [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants term | 3 months 29 days | 9 months 25 days
Maximum [Member] | 'Expected Volatility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input | 3.7200 | 2.6692
Maximum [Member] | Risk-free Interest Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input | 0.0292 | 0.0206
Maximum [Member] | Expected Life [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants term | 6 years 4 months 24 days | 4 years 10 months 17 days
November 2017 Warrants [Member] | 'Expected Volatility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 2.1739
November 2017 Warrants [Member] | Risk-free Interest Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 0.0198
November 2017 Warrants [Member] | Expected Life [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants term |  | 4 years 10 months 17 days
October 2016 Warrants [Member] | 'Expected Volatility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 1.3088
October 2016 Warrants [Member] | Risk-free Interest Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 0.0206
October 2016 Warrants [Member] | Expected Life [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants term |  | 3 years 9 months 3 days
July 2015 Series A Warrants [Member] | 'Expected Volatility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 1.6187
July 2015 Series A Warrants [Member] | Risk-free Interest Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 0.0194
July 2015 Series A Warrants [Member] | Expected Life [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants term |  | 2 years 6 months 21 days
February 2015 Warrants [Member] | 'Expected Volatility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 1.6995
February 2015 Warrants [Member] | Risk-free Interest Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 0.0190
February 2015 Warrants [Member] | Expected Life [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants term |  | 2 years 1 month 16 days
October 2013 Warrants [Member] | 'Expected Volatility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 2.6692
October 2013 Warrants [Member] | Risk-free Interest Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants measurement input |  | 0.0168
October 2013 Warrants [Member] | Expected Life [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Warrants term |  | 9 months 25 days

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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