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Warrants - Summary of Key Terms and Activity of Liability Classified Common Stock Warrants (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Class Of Warrant Or Right [Line Items]
Warrants Outstanding	5,463,620	400,230
September 2019 Warrants [Member]
Class Of Warrant Or Right [Line Items]
Issuance Date	2019-09
Term	5 years 6 months
Exercise Price Per Share	$ 7.52
Warrants Outstanding	659,414	659,414
June 2019 Warrants [Member]
Class Of Warrant Or Right [Line Items]
Issuance Date	2019-06
Term	5 years 6 months
Exercise Price Per Share	$ 5.00
Warrants Exercised during the Year		1,053,745
Warrants Outstanding	435,830	435,830
June 2018 Warrants [Member]
Class Of Warrant Or Right [Line Items]
Issuance Date	2018-06
Term	5 years 6 months
Exercise Price Per Share	$ 9.94
Warrants Exercised during the Year	1,392,345
Warrants Outstanding		1,392,345
March 2018 Warrants [Member]
Class Of Warrant Or Right [Line Items]
Issuance Date	2018-03
Term	5 years
Exercise Price Per Share	$ 10.73
Warrants Exercised during the Year	641,416
Warrants Outstanding	641,416	1,282,832
September 2019, June 2019, June 2018 and March 2018 Warrants [Member]
Class Of Warrant Or Right [Line Items]
Warrants Exercised during the Year	2,033,761	1,053,745
Warrants Outstanding	1,736,660	3,770,421

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- Definition

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+ References

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- Definition

Stock issued during period shares related to exercise of warrants.

+ References

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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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.

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- Definition

Number of warrants or rights outstanding.

+ References

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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=117815213&loc=d3e19207-110258

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