Warrants - Summary of Warrant Activity (Detail)	9 Months Ended
Sep. 30, 2019 shares
Warrants And Rights Note Disclosure [Abstract]
Warrants outstanding, January 1, 2019	7,344,297
Issuances (Note 8)	3,052,959
Exchanges	(1,550)
Exercises and conversions	(11,000)
Warrants outstanding, September 30, 2019	10,384,706

The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration