v3.21.1

Summary of Significant Accounting Policies; Prior Period Reclassification - Summary of Financial Assets and Liabilities Measured at Fair Value (Detail) - Recurring [Member] - Level 3 [Member] - Derivative Liability [Member] - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 01, 2020	Jan. 30, 2021	Dec. 31, 2019
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, December 31, 2018	$ 1,721	$ 2,528
Initial recognition of conversion features and warrants			$ 7,954
Change in fair value of derivative liability	807	(543)	(6,233)
Derecognition of derivative liability upon debt conversion and cancellation of warrants		$ (1,985)
Balance, December 31, 2019	$ 2,528		$ 1,721

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability initial recognition of conversion features and warrants.

+ References

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- Definition

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+ References

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ 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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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