ACCRUED EXPENSES (Tables)

9 Months Ended

Sep. 30, 2020

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 September 30, 2020		As of December 31, 2019
	(in thousands)
Product revenue related reserves	$	44,798	$	45,249
Accrued contract manufacturing costs		42,583		27,622
Accrued employee compensation costs		34,535		43,240
Accrued clinical and pre-clinical costs		26,955		18,010
Accrued professional fees		10,508		10,707
Accrued milestone expense		9,388		18,390
Accrued property and equipment		8,055		1,181
Accrued royalties		7,813		6,301
Accrued collaboration cost sharing		6,463		9,000
Accrued interest expense		3,182		1,045
Other		4,783		4,782
Total accrued expenses	$	199,063	$	185,527