Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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Name:	us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Feb. 29, 2020	Mar. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Outstanding principal balance of convertible senior note due to related parties		$ 3	$ 3
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Common stock shares issued	13,037
Issuance of common stock public offering price	$ 10
Board of Directors [Member]
Related Party Transaction [Line Items]
Common stock shares issued	1,250
Issuance of common stock public offering price	$ 1