Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock-Based Compensation Expense

Stock-based compensation expense, included within “total operating costs and expenses” for the three months ended March 31, 2019 and 2018, was as follows:

	Three Months Ended March 31,
	2019		2018
Selling, general and administrative	$	3,626	$	2,253
Research and development	969		632
Total stock-based compensation	$	4,595	$	2,885