SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Tables)

12 Months Ended

Dec. 31, 2020

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS

	Years Ended December 31,
	2020			2019			2018
	(in thousands)
Allowance for bad debts:
Beginning balance	$	546		$	445		$	679
Additions		470			330			241
Write-offs		(674	)		(229	)		(475	)
Ending balance	$	342		$	546		$	445
Allowance for customer credits:
Beginning balance	$	194		$	121		$	213
Additions		(26	)		250			198
Write-offs		(104	)		(177	)		(290	)
Ending balance	$	64		$	194		$	121
Tax valuation allowance:
Beginning balance	$	31,168		$	28,687		$	21,318
Charged (credited) to tax expense		(721	)		2,481			7,369
Charged (credited) to retained earnings		—			—			—
Ending balance	$	30,447		$	31,168		$	28,687