Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 199,621	$ 217,413	$ 429,307	$ 419,930
Cost of revenues	116,396	113,368	236,460	218,768
Gross profit	83,225	104,045	192,847	201,162
Operating expenses:
Research and development	20,830	16,848	39,482	32,926
Selling, general, and administrative	69,386	68,434	148,205	136,712
Total operating expenses	90,216	85,282	187,687	169,638
Income (loss) from operations	(6,991)	18,763	5,160	31,524
Interest and other income (expense), net	174	(1,629)	(648)	(3,039)
Income (loss) before provision for income taxes	(6,817)	17,134	4,512	28,485
Provision for (benefit from) income taxes	(2,518)	1,158	(2,500)	9,225
Net income (loss)	$ (4,299)	$ 15,976	$ 7,012	$ 19,260
Net income (loss) per share:
Net income (loss) per share - basic (in dollars per share)	$ (0.10)	$ 0.39	$ 0.16	$ 0.47
Net income (loss) per share - diluted (in dollars per share)	$ (0.10)	$ 0.37	$ 0.16	$ 0.45
Weighted-average shares outstanding:
Weighted-average shares outstanding — basic (in shares)	42,659	41,371	42,509	41,033
Weighted-average shares outstanding — diluted (in shares)	42,659	42,945	43,616	42,646
Product revenues
Revenues	$ 138,942	$ 158,379	$ 309,015	$ 303,989
Cost of revenues	85,779	84,583	176,051	163,394
Services and other revenues
Revenues	60,679	59,034	120,292	115,941
Cost of revenues	$ 30,617	$ 28,785	$ 60,409	$ 55,374