ACCRUED EXPENSES

6 Months Ended

Jun. 30, 2019

Payables And Accruals [Abstract]

ACCRUED EXPENSES

9. ACCRUED EXPENSES

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

	As of June 30, 2019		As of December 31, 2018
	(in thousands)
Product revenue related reserves	$	30,821	$	26,146
Accrued employee compensation costs		23,205		24,692
Accrued clinical and pre-clinical costs		15,706		11,396
Accrued contract manufacturing costs		12,699		15,794
Accrued professional fees		8,963		11,319
Accrued royalties		5,819		8,254
Accrued property and equipment		2,902		5,421
Accrued research costs		1,733		1,070
Accrued interest expense		1,045		1,045
Accrued collaboration cost sharing		541		2,167
Accrued milestone expense		492		24,020
Other		3,402		2,771
Total accrued expenses	$	107,328	$	134,095