Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues	$ 11,381	$ 13,322
Cost of revenues	1,545	1,173
Gross profit	9,836	12,149
Operating expenses:
Selling and marketing	4,232	2,787
Research and development	5,183	3,729
General and administrative	3,658	3,668
Restructuring expense		6
Total operating expenses	13,073	10,190
Operating income (loss)	(3,237)	1,959
Other income:
Interest income, net	8	86
Other income	4
Income (loss) before provision for income taxes	(3,225)	2,045
Net income (loss)	$ (3,225)	$ 2,045
Earnings (loss) per share:
Basic and diluted	$ (0.07)	$ 0.05
Weighted average shares outstanding:
Basic	43,368	39,482
Diluted	43,368	42,194