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Stock-Based Compensation - Summary of Warrant Activity (Detail) - Outstanding Warrants - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Class Of Warrant Or Right [Line Items]
Number of shares Warrants, Beginning Balance	1,638,000	21,302,049
Number of shares Warrants exercised	0	(19,664,049)
Number of shares Warrants, Ending Balance	1,638,000	1,638,000

X

- Definition

Stock issued during period shares warrants exercised.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: