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Fair Value Measurements - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Input | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 30, 2017 USD ($) | Nov. 30, 2016 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Number of inputs used for valuation of warrants | Input |  |  | 6 |  |  |  |
Derivative warrant liability [Abstract] |  |  |  |  |  |  |
Change in fair value of the warrant liability, net | $ 14,697 | $ 1,238 | $ 15,103 | $ 12,780 | $ 564 |  |
Derivative warrant liabilities | 4,169 |  | $ 560 | $ 18,751 |  |  |
Derivative warrant liabilities | $ 4,200 |  |  |  |  |  |
November 2017 Warrants [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |
Derivative warrant liability [Abstract] |  |  |  |  |  |  |
Value of warrants issued |  |  |  |  |  | $ 14,400 | $ 14,400

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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