ACCRUED EXPENSES (Tables)

6 Months Ended

Jun. 30, 2017

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 June 30, 2017		As of December 31, 2016
	(in thousands)
Accrued clinical and preclinical costs	$	11,148	$	10,033
Accrued employee compensation costs		8,035		8,748
Accrued contract manufacturing costs		5,886		4,673
Accrued professional fees		5,012		2,799
Accrued EXONDYS 51 litigation and license charges		2,839		—
Product revenue related reserves		1,864		305
Accrued research costs		547		1,186
Other		3,848		3,272
Total accrued expenses	$	39,179	$	31,016