Stock-based compensation (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2020		2019
Cost of goods sold	$	1,067	$	847
Research and development	1,677		1,708
Selling, general and administrative	4,902		5,535
Stock-based compensation expense before income taxes	$	7,646	$	8,090

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

	March 31,
	2020		2019
Capitalized in inventory	$	879	$	1,279