Redeemable Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	Aug. 30, 2017	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2017
Temporary Equity [Line Items]
Temporary equity, stock issued during period, shares, new issues		150,000		150,000	150,000
Proceeds from issuance of redeemable preferred shares					$ 150,000
Temporary equity, par value		$ 0.01		$ 0.01	$ 0.01
Preferred stock, dividend rate, percentage		9.00%	9.00%
Preferred stock redemption date		Sep. 14, 2025
Issuance costs					$ 3,700
Proceeds from issuance of redeemable preferred shares, net of issuance costs					135,500
Embedded derivative liability					$ 10,900
Cumulative premium accretion		$ 48,800		$ 43,900
Redeemable preferred stock		184,308		$ 179,387
Convertible Preferred Stock Redemption Period Two [Member]
Temporary Equity [Line Items]
Convertible preferred stock, redemption value		$ 300,000
Convertible preferred stock, redemption value percent of stated value		200.00%
Convertible preferred stock, face value		$ 150,000
Common stock, shares issued upon conversion of preferred stock		5,300,000
Series A Redeemable Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary equity, stock issued during period, shares, new issues					140,202
Temporary equity, par value	$ 0.01
Temporary equity, liquidation preference per share	1,000
Temporary equity, conversion price	$ 28.162
Preferred stock, dividend rate, percentage	9.00%
Convertible preferred stock, threshold stock price trigger					$ 84.49
Series B Redeemable Preferred Stock [Member]
Temporary Equity [Line Items]
Temporary equity, stock issued during period, shares, new issues					9,798