Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial information

	Quarter Ended
	Dec 31, 2020			Sep 30, 2020			Jun 30, 2020			Mar 31, 2020			Dec 31, 2019			Sep 30, 2019			Jun 30, 2019			Mar 31, 2019
	(in thousands, except per-share amounts)
Total net revenues	$	17,252		$	17,813		$	17,033		$	24,472		$	26,687		$	28,552		$	27,142		$	31,604
Gross profit (loss)	$	5,860		$	6,423		$	6,040		$	5,357		$	5,522		$	5,907		$	5,384		$	5,757
Net income (loss)	$	(937	)	$	(448	)	$	(1,374	)	$	(4,061	)	$	(3,177	)	$	(1,739	)	$	(4,953	)	$	(5,360	)
Basic earnings (loss) per share	$	(0.07	)	$	(0.03	)	$	(0.10	)	$	(0.31	)	$	(0.24	)	$	(0.13	)	$	(0.38	)	$	(0.41	)
Diluted earnings (loss) per share	$	(0.07	)	$	(0.03	)	$	(0.10	)	$	(0.31	)	$	(0.24	)	$	(0.13	)	$	(0.38	)	$	(0.41	)