Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 213,699	$ 228,805	$ 643,006	$ 648,735
Cost of revenues	116,908	116,658	353,368	335,426
Gross profit	96,791	112,147	289,638	313,309
Operating expenses:
Research and development	15,197	16,625	54,679	49,551
Selling, general, and administrative	71,442	70,876	219,647	207,588
Total operating expenses	86,639	87,501	274,326	257,139
Income from operations	10,152	24,646	15,312	56,170
Interest and other income (expense), net	809	(1,168)	161	(4,207)
Income before provision for income taxes	10,961	23,478	15,473	51,963
Provision for (benefit from) income taxes	2,156	3,495	(344)	12,720
Net income	$ 8,805	$ 19,983	$ 15,817	$ 39,243
Net income per share:
Net income per share - basic (in dollars per share)	$ 0.21	$ 0.48	$ 0.37	$ 0.95
Net income per share - diluted (in dollars per share)	$ 0.20	$ 0.46	$ 0.36	$ 0.92
Weighted-average shares outstanding:
Weighted-average shares outstanding — basic (in shares)	42,802	41,771	42,606	41,283
Weighted-average shares outstanding — diluted (in shares)	43,691	43,052	43,651	42,796
Product revenues
Revenues	$ 151,337	$ 168,488	$ 460,352	$ 472,477
Cost of revenues	86,689	86,695	262,740	250,089
Services and other revenues
Revenues	62,362	60,317	182,654	176,258
Cost of revenues	$ 30,219	$ 29,963	$ 90,628	$ 85,337