Earnings Per Share - Additional Information (Detail) - 4.50 % Convertible Senior Notes - $ / shares	Sep. 30, 2020	Aug. 21, 2020
Earnings Per Share Disclosure [Line Items]
Interest rate	4.50%	4.50%
Warrants, per share	$ 22.08
Common shares issued	32,051,282

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant