Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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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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- 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

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Key Assumptions Used to Value the Warrants (Detail)	Dec. 31, 2018 $ / shares	Jun. 30, 2018 $ / shares	Dec. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares	May 13, 2016 $ / shares
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Stock price	$ 1.60
Settlement Warrants
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Stock price		$ 2.90	$ 2.79
Measurement Input, Price Volatility \| Settlement Warrants
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Expected price volatility		62.74	101.52
Measurement Input, Expected Term \| Settlement Warrants
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Expected term (in years)		1 year	1 year
Measurement Input, Risk Free Interest Rate \| Settlement Warrants
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Expected price volatility		2.37	1.76
Measurement Input, Expected Dividend Rate \| Settlement Warrants
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Expected price volatility		0	0
PIPE Warrants
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Stock price	$ 1.60		$ 2.79	$ 0.54	$ 0.89
PIPE Warrants \| Measurement Input, Price Volatility
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Expected price volatility	82.64		84.86	78.18	76.25
PIPE Warrants \| Measurement Input, Expected Term
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Expected term (in years)	2 years 6 months		3 years 6 months	4 years 6 months	5 years
PIPE Warrants \| Measurement Input, Risk Free Interest Rate
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Expected price volatility	2.47		2.09	1.93	1.22
PIPE Warrants \| Measurement Input, Expected Dividend Rate
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Expected price volatility	0		0	0	0