Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2020

Valuation Allowance [Abstract]

Allowance For Doubtful Accounts

Activity in the allowance for credit losses is summarized as follows for the years presented (in thousands):

	Year Ended December 31,
	2020		2019		2018
Balance at December 31	$	464	$	810	$	1,272
Impact of ASU No. 2016-13 adoption	423		—		—
Opening balance at January 1	887		810		1,272
Charges to expense, net of recoveries	855		428		393
Uncollected balances written off	(677)		(774)		(855)
Balance at December 31	$	1,065	$	464	$	810