Stock-based compensation (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Cost of goods sold	$	1,668	$	709	$	2,735	$	1,556
Research and development	2,277		1,951		3,954		3,631
Selling, general and administrative	9,296		6,528		14,198		12,091
Stock-based compensation expense before income taxes	$	13,241	$	9,188	$	20,887	$	17,278

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

	June 30,
	2020		2019
Capitalized in inventory	$	453	$	1,016