Stockholders' Equity - Additional Information (Detail) - USD ($)			12 Months Ended
	Sep. 30, 2020	Mar. 17, 2020	Dec. 31, 2020	Sep. 29, 2020
Class Of Stock [Line Items]
Transaction costs recorded net against allocated gross proceeds in additional paid-in-capital		$ 5,150,000
Class 1 Common Stock [Member]
Class Of Stock [Line Items]
Conversion of stock, shares converted	13,159,762
Common stock ceased to represent percentage of outstanding common stock	10.00%
Common stock, shares authorized	233,333,333		233,333,333	250,000,000
Common stock, shares retired	16,666,667
Common stock, par value	$ 0.0001		$ 0.0001
Common stock, shares outstanding			0
Common Stock Class Two
Class Of Stock [Line Items]
Common stock, shares authorized			500,000,000
Common stock, par value			$ 0.0001
Common stock issued, Shares		7,250,000	16,131,487
Proceeds from issuance of common stock, gross			$ 127,041,000
Transaction costs recorded net against allocated gross proceeds in additional paid-in-capital		$ 1,197,000	2,541,000
Maximum allowed aggregate gross proceeds from share issuance under ATM program			20,000,000
Maximum amount of share issuance allowed per quarter			$ 6,000,000