Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Summary of Stock-Based Compensation

The following table summarizes our stock-based compensation:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(in thousands)				(in thousands)
Stock-based compensation capitalized in inventory	$	55	$	—	$	83	$	—
Cost of sales	55		—		83		—
Research and development	2,505		1,963		4,484		3,427
Selling, general and administrative	5,176		4,054		9,865		7,544
Total stock-based compensation	$	7,791	$	6,017	$	14,515	$	10,971