Stock-based compensation (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Compensation [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

The following table sets forth the stock-based compensation expense recognized in the Consolidated Statements of Income (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of goods sold	$	769	$	843	$	2,326	$	2,313
Research and development	2,296		1,967		5,981		5,014
Selling, general and administrative	7,028		7,752		19,064		17,635
Stock-based compensation expense before income taxes	$	10,093	$	10,562	$	27,371	$	24,962

Stock-based compensation expense capitalized in the Consolidated Balance Sheets is as follows (in thousands):

	September 30,
	2019		2018
Capitalized in inventory	$	1,194	$	1,115