Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	Jan. 14, 2021	Nov. 24, 2020	Apr. 30, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Class Of Stock [Line Items]
Proceeds from issuance of Class A Common Stock, net of offering costs				$ 8,038
Class A Common Stock [Member]
Class Of Stock [Line Items]
Common stock par value				$ 0.01		$ 0.01
Cantor Fitzgerald [Member] | ATM Offering [Member] | Class A Common Stock [Member]
Class Of Stock [Line Items]
Common stock par value			$ 0.01
Aggregate offering price	$ 5,500
Shares sold				0	0
Cantor Fitzgerald [Member] | ATM Offering [Member] | Class A Common Stock [Member] | Maximum [Member]
Class Of Stock [Line Items]
Aggregate offering price			$ 13,000
LPC Purchase Agreement [Member] | Class A Common Stock [Member]
Class Of Stock [Line Items]
Stock Issued During Period Shares New Issues				3,500,000
Proceeds from issuance of Class A Common Stock, net of offering costs		$ 8,000
LPC Purchase Agreement [Member] | Class A Common Stock [Member] | Maximum [Member]
Class Of Stock [Line Items]
Aggregate offering price		$ 47,000