ACCRUED EXPENSES (Tables)

9 Months Ended

Sep. 30, 2019

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, 2019		As of December 31, 2018
	(in thousands)
Product revenue related reserves	$	35,069	$	26,146
Accrued employee compensation costs		28,053		24,692
Accrued clinical and pre-clinical costs		15,595		11,396
Accrued contract manufacturing costs		15,250		15,794
Accrued professional fees		11,938		11,319
Accrued royalties		6,350		8,254
Accrued interest expense		3,183		1,045
Accrued property and equipment		2,117		5,421
Accrued research costs		778		1,070
Accrued collaboration cost sharing		541		2,167
Accrued milestone expense		152		24,020
Other		2,637		2,771
Total accrued expenses	$	121,663	$	134,095