Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Stockholders Equity [Abstract]

Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense for the three months ended March 31, 2019 and 2018 (in thousands):

	Three Months Ended March 31,
	2019		2018
Cost of sales - product	$	118	$	—
Research and development expenses		3,921		2,314
Selling, general and administrative expenses		14,521		4,070
Total	$	18,560	$	6,384