Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [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, 2020 and 2019, was as follows:

	Three Months Ended March 31,
	2020		2019
Selling, general and administrative	$	3,877	$	3,626
Research and development	1,398		969
Total stock-based compensation*	$	5,275	$	4,595

* Beginning in March 2020, we granted 1,650,000 stock-appreciation rights (“SARs”) to our Named Executive Officers. The fair value of these SARs was estimated on the date of grant using the Black-Scholes option-pricing model. These SARs had 25% immediate vesting on the date of grant resulting in recognized stock-based compensation expense of $0.7 million and $0, respectively, within our Condensed Consolidated Statements of Operations for the three months ended March 31, 2020 and 2019.