Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenues	$ 12,674	$ 15,919	$ 25,409	$ 27,300
Cost of revenues	3,617	3,358	7,253	4,903
Gross profit	9,057	12,561	18,156	22,397
Operating expenses:
Selling and marketing	3,720	3,117	6,706	5,361
Research and development	8,213	7,063	15,615	11,936
General and administrative	4,026	4,946	8,073	8,604
Amortization of intangible assets	1,577	2,645	3,221	4,943
Total operating expenses	17,536	17,771	33,615	30,844
Operating loss	(8,479)	(5,210)	(15,459)	(8,447)
Other income (expense):
Interest income (expense), net	2	16	(2)	24
Other income, net	15	5	15	9
Loss before provision for income taxes	(8,462)	(5,189)	(15,446)	(8,414)
Provision for income tax expense	31	14	50	14
Net loss	$ (8,493)	$ (5,203)	$ (15,496)	$ (8,428)
Loss per share:
Basic (in dollars per share)	$ (0.15)	$ (0.10)	$ (0.28)	$ (0.17)
Diluted (in dollars per share)	$ (0.15)	$ (0.10)	$ (0.28)	$ (0.17)
Weighted average shares outstanding:
Basic (in shares)	55,183	53,017	55,844	48,219
Diluted (in shares)	55,183	53,017	55,844	48,219