Stock-based compensation (Tables)

3 Months Ended

Mar. 31, 2021

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,
	2021		2020
Cost of goods sold	$	1,268	$	1,067
Research and development	2,228		1,677
Selling, general and administrative	6,264		4,902
Stock-based compensation expense before income taxes	$	9,760	$	7,646

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

	March 31,
	2021		2020
Capitalized in inventory	$	1,493	$	879