Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Summary of stock-based compensation

The following table summarizes our stock-based compensation:

	Three Months Ended March 31,
	2020		2019
	(in thousands)
Stock-based compensation capitalized in inventory	$	70	$	28
Cost of sales	23		28
Research and development	2,605		1,979
Selling, general and administrative	5,290		4,689
Total stock-based compensation	$	7,988	$	6,724