Warrants - Summary of Warrant Activity (Detail) - shares	1 Months Ended	12 Months Ended
Aug. 31, 2017	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Warrants outstanding, beginning		10,384,706	7,344,297
Issuances	78,181	1,631,794	3,052,959
Exercises		(10,238,889)	(12,550)
Warrants outstanding, ending		1,777,611	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=121583591&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=121583591&loc=d3e4332-108586

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