CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Revenue:
Revenue	$ 270,245		$ 194,032	$ 141,236
Costs and operating expenses:
Cost of product revenue	119,099		86,531	67,050
Research and development	19,450		15,821	8,672
Selling, general and administrative	95,613		65,692	51,509
Total costs and operating expenses	234,162		168,044	127,231
Income from operations	36,083		25,988	14,005
Other (expenses) income:
Investment income	5,324		1,895	371
Loss on extinguishment of debt	(5,650)
Interest expense	(9,292)		(6,709)	(6,441)
Other (expenses) income	(314)		262	(687)
Other expenses, net	(9,932)		(4,552)	(6,757)
Income before income taxes	26,151		21,436	7,248
Income tax provision (benefit)	4,740		4,819	(21,105)
Net income	$ 21,411		$ 16,617	$ 28,353
Earnings per share:
Basic	$ 0.44		$ 0.38	$ 0.74
Diluted	$ 0.44		$ 0.37	$ 0.72
Weighted average common shares outstanding:
Basic	48,343		43,767	38,234
Diluted	49,206		45,471	39,150
Net income	$ 21,411		$ 16,617	$ 28,353
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,134)		(5,530)	7,381
Unrealized gain on marketable securities				5
Comprehensive income	18,277		11,087	35,739
Products
Revenue:
Revenue	270,097	[1]	193,891	141,089	[2]
Royalty and Other Revenue
Revenue:
Revenue	$ 148		$ 141	$ 147

[1] 2019 revenue for process analytics products includes revenue related to C Technologies from May 31, 2019 through December 31, 2019.

[2] 2017 revenue for filtration, chromatography and other products includes revenue related to Spectrum from August 1, 2017 through December 31, 2017.