Warrants - Summary of Warrant Activity (Detail) - shares	1 Months Ended	12 Months Ended
Aug. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Warrants outstanding, January 1		7,344,297	78,336
Issuances	78,181	3,052,959	7,342,530
Exercises, conversions, exchanges and repurchases		(12,550)	(76,569)
Warrants outstanding, December 31		10,384,706	7,344,297

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration