Accounts Receivable, Net

12 Months Ended

Dec. 31, 2019

Accounts Receivable Net [Abstract]

Accounts Receivable, Net

(3) Accounts Receivable, Net

Accounts receivable, net, is as follows (in thousands):

	As of December 31,
	2019			2018
Accounts receivable	$	69,767		$	41,818
Allowance for doubtful accounts		(1,125	)		(711	)
Net accounts receivable	$	68,642		$	41,107

Bad debt expense for the years ended December 31, 2019, 2018 and 2017 was $0.7 million, $0.1 million and $0.6 million, respectively.

The following table summarizes the changes in the allowance for doubtful accounts (in thousands):

	Year Ended December 31,
	2019			2018			2017
Balance, beginning of period	$	(711	)	$	(863	)	$	(374	)
Additions		(971	)		(58	)		(558	)
Write-offs		557			210			69
Balance, end of period	$	(1,125	)	$	(711	)	$	(863	)

The following table summarizes the changes in the sales reserve (in thousands):

	Year Ended December 31,
	2019			2018			2017
Balance, beginning of period	$	(200	)	$	(100	)	$	(45	)
(Additions) reductions		16			(193	)		(79	)
Write-offs		9			93			24
Balance, end of period	$	(175	)	$	(200	)	$	(100	)