ACCRUED EXPENSES

6 Months Ended

Jun. 30, 2018

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, 2018		As of December 31, 2017
	(in thousands)
Accrued employee compensation costs	$	17,949	$	14,402
Product revenue related reserves		16,867		7,302
Accrued clinical and preclinical costs		11,068		15,975
Accrued contract manufacturing costs		8,421		14,019
Accrued professional fees		7,578		6,794
Accrued BioMarin royalties		3,695		2,846
Accrued collaboration cost sharing		2,699		—
Accrued interest expense		1,251		1,291
Accrued research costs		729		401
Accrued income taxes		523		943
Accrued property and equipment		289		2,525
Other		1,408		2,484
Total accrued expenses	$	72,477	$	68,982