ACCRUED EXPENSES (Tables)

3 Months Ended

Mar. 31, 2021

Payables And Accruals [Abstract]

Summary of Accrued Expenses

The following table summarizes the Company’s accrued expenses for each of the periods indicated: 

	As of March 31, 2021		As of December 31, 2020
	(in thousands)
Product revenue related reserves	$	48,448	$	42,618
Accrued contract manufacturing costs		34,556		36,543
Accrued clinical and pre-clinical costs		24,580		22,169
Accrued employee compensation costs		23,520		50,803
Accrued professional fees		10,990		10,221
Accrued milestone expense		9,377		9,380
Accrued collaboration cost sharing		8,962		3,516
Accrued royalties		8,019		7,793
Accrued property and equipment		5,056		4,993
Accrued interest expense		3,182		1,045
Other		3,946		4,472
Total accrued expenses	$	180,636	$	193,553