Supplemental Balance Sheet Information (Tables)

9 Months Ended

Sep. 30, 2017

Supplemental Balance Sheet Information [Abstract]

Property, Plant and Equipment

Property and equipment, net

	September 30, 2017			December 31, 2016
Scientific equipment	$	1,586		$	993
Leasehold improvements	192			57
Furniture and fixtures	31			27
Computers and software	26			26
Construction in process	—			17
Property and equipment, gross	1,835			1,120
Less: accumulated depreciation	(776		)	(617		)
Property and equipment, net	$	1,059		$	503

Schedule of Accrued Liabilities

Accrued expenses and other current liabilities

	September 30, 2017		December 31, 2016
Accrued Northwestern University License Agreements fee (Note 11)	$	—	$	1,500
Accrued legal expenses	1,004		123
Accrued payroll-related expenses	513		423
Other accrued expenses	979		114
Accrued expenses and other current liabilities	$	2,496	$	2,160