Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 22,796	$ 20,764	$ 42,591	$ 34,571
Operating expenses:
General and administrative	5,500	4,927	11,079	10,764
Sales and marketing	2,181	1,858	4,343	3,770
Research and development	5,480	3,605	9,734	7,522
Amortization of intangible assets	157	158	313	316
Total operating expenses	13,318	10,548	25,469	22,372
Income from operations	3,995	4,240	6,704	2,909
Other income (expense):
Interest income	528	373	1,051	674
Interest expense	0	(1)	0	(1)
Other non-operating (expense) income, net	(48)	9	(72)	(44)
Total other income, net	480	381	979	629
Income before income taxes	4,475	4,621	7,683	3,538
Provision for (benefit from) income taxes	756	(11,122)	1,310	(11,479)
Net income	$ 3,719	$ 15,743	$ 6,373	$ 15,017
Earnings per share:
Basic (in dollars per share)	$ 0.07	$ 0.29	$ 0.12	$ 0.28
Diluted (in dollars per share)	$ 0.07	$ 0.28	$ 0.11	$ 0.27
Number of shares used in per share calculations:
Basic (in shares)	54,681	53,747	54,400	53,747
Diluted (in shares)	56,110	55,406	55,764	55,437
Product
Revenue	$ 19,226	$ 17,406	$ 35,298	$ 28,464
Product cost of revenue	5,483	5,976	10,418	9,290
Product gross profit	13,743	11,430	24,880	19,174
License and development revenue
Revenue	$ 3,570	$ 3,358	$ 7,293	$ 6,107