Credit Losses - Summary Of Allowance For Credit Losses For Accounts Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Credit Loss [Abstract]
Beginning balance	$ (621)	$ (538)	$ (658)	$ (525)
Current period change for write-offs	65		37
Current period change for expected credit losses	(206)	(83)	83	(133)
Ending balance	$ (762)	$ (621)	$ (538)	$ (658)