Stock-based compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

Share-based Payment Arrangement, Expensed and Capitalized, Amount [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,
	2020		2019		2020		2019
Cost of goods sold	$	491	$	769	$	3,226	$	2,326
Research and development	1,863		2,296		5,817		5,981
Selling, general and administrative	7,306		7,028		21,504		19,064
Stock-based compensation expense before income taxes	$	9,660	$	10,093	$	30,547	$	27,371

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

	September 30,
	2020		2019
Capitalized in inventory	$	1,171	$	1,194