Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Amortization period of deferred issuance costs	5 years
Reduction to equity	$ (236,392)	$ (306,948)		$ (135,134)	$ (104,151)
Reduction to accumulated deficit / increase to retained earnings	(562,211)	(542,030)
Additional Paid-in Capital
Significant Accounting Policies [Line Items]
Reduction to equity	(798,589)	(848,891)		(605,622)	(535,954)
Accumulated Deficit
Significant Accounting Policies [Line Items]
Reduction to equity	$ 562,211	542,030		$ 470,576	$ 431,952
Cumulative Effect, Period of Adoption, Adjustment
Significant Accounting Policies [Line Items]
Reduction to equity		51,012
Reduction to accumulated deficit / increase to retained earnings		7,500
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-in Capital
Significant Accounting Policies [Line Items]
Reduction to equity		58,543
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
Significant Accounting Policies [Line Items]
Reduction to equity		$ (7,531)
Senior Notes | Convertible Notes
Significant Accounting Policies [Line Items]
Debt instrument stated rate			2.625%