Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 15,919	$ 12,933	$ 27,300	$ 26,255
Cost of revenues	3,358	1,269	4,903	2,441
Gross profit	12,561	11,664	22,397	23,814
Operating expenses:
Selling and marketing	4,853	2,613	9,085	5,400
Research and development	7,972	4,604	13,155	8,333
General and administrative	4,946	3,070	8,604	6,744
Total operating expenses	17,771	10,287	30,844	20,477
Operating income (loss)	(5,210)	1,377	(8,447)	3,337
Other income:
Interest income, net	16	2	24	87
Other income	5		9
Income (loss) before provision for income taxes	(5,189)	1,379	(8,414)	3,424
Provision for income tax expense	14		14
Net income (loss)	$ (5,203)	$ 1,379	$ (8,428)	$ 3,424
Earnings (loss) per share:
Basic and diluted	$ (0.10)	$ 0.03	$ (0.17)	$ 0.08
Weighted average shares outstanding:
Basic	53,017	41,127	48,219	40,305
Diluted	53,017	43,079	48,219	42,346