STOCK-BASED COMPENSATION

3 Months Ended

Mar. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

STOCK-BASED COMPENSATION

12. STOCK-BASED COMPENSATION

The following table summarizes the Company’s stock awards granted for each of the periods indicated:

	For the Three Months Ended March 31,
	2021				2020
	Grants		Weighted Average Grant Date Fair Value		Grants		Weighted Average Grant Date Fair Value
Stock options		1,359,637	$	49.35		1,085,330	$	56.80
Restricted stock units		689,367	$	87.14		498,910	$	114.28

Stock-based Compensation Expense

For the three months ended March 31, 2021 and 2020, total stock-based compensation expense was $28.5 million and $24.0 million, respectively. The following table summarizes stock-based compensation expense by function included within the unaudited condensed consolidated statements of operations and comprehensive loss: 

	For the Three Months Ended March 31,
	2021		2020
Research and development	$	11,126	$	9,249
Selling, general and administrative		17,382		14,775
Total stock-based compensation expense	$	28,508	$	24,024

The following table summarizes stock-based compensation expense by grant type included within the unaudited condensed consolidated statements of operations and comprehensive loss:

	For the Three Months Ended March 31,
	2021		2020
Stock options	$	17,019	$	15,355
Restricted stock awards/units		9,931		6,745
Employee stock purchase plan		1,558		1,924
Total stock-based compensation expense	$	28,508	$	24,024