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Fair Value Measurements - Schedule of Assumptions Used to Value Liability (Detail) - Second Tranche Transaction Liability [Member]	Jun. 25, 2018 shares	Mar. 28, 2018 shares
Estimated date of stockholder approval		2018-06
Estimated number of units issuable at the estimated date of stockholder approval		26,900,000
Units issued to investors, with each Unit consisting of one share of common stock and one warrant to purchase one share of common stock	20,184,224
Volatility % [Member]
Measurement input		54.20
Risk Free Interest Rate [Member]
Measurement input		1.70
Stock Price [Member]
Measurement input	1.93	1.07

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- Definition

Fair value assumption estimated date of stockholder approval.

+ References

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- Definition

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+ References

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- Definition

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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

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