Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2017

Payables and Accruals [Abstract]

Summary of Accrued Expenses

Accrued expenses consist of the following (in thousands):

	June 30, 2017		December 31, 2016
Accrued compensation	$	8,721	$	11,092
Accrued research and development costs	17,714		20,266
Accrued professional fees	2,370		476
Accrued other	836		168
Total	$	29,641	$	32,002