Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2014

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	DECEMBER 31,
	2013		2014
Research and development services	$	214	$	1,845
Legal and professional services	191		1,253
Employee compensation	649		1,379
Unearned revenue	28		524
Total accrued liabilities	$	1,082	$	5,001