Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Total revenues	$ 202,517	$ 182,619
Cost of revenues:
Total cost of revenues	105,400	100,164
Gross profit	97,117	82,455
Operating expenses:
Research and development	16,078	16,537
Selling, general, and administrative	68,278	65,285
Total operating expenses	84,356	81,822
Income from operations	12,761	633
Interest and other income (expense), net	(1,410)	(2,729)
Income (loss) before provision for income taxes	11,351	(2,096)
Provision for (benefit from) income taxes	8,067	(4,816)
Net income	$ 3,284	$ 2,720
Net income per share:
Net income per share - basic (in dollars per share)	$ 0.08	$ 0.07
Net income per share - diluted (in dollars per share)	$ 0.08	$ 0.07
Weighted-average shares outstanding:
Weighted-average shares outstanding — basic (in shares)	40,692	38,635
Weighted-average shares outstanding — diluted (in shares)	42,281	39,691
Product revenues
Revenues:
Total revenues	$ 145,610	$ 130,659
Cost of revenues:
Total cost of revenues	78,811	75,417
Services and other revenues
Revenues:
Total revenues	56,907	51,960
Cost of revenues:
Total cost of revenues	$ 26,589	$ 24,747