Supplemental Balance Sheet Information

9 Months Ended

Sep. 30, 2019

Supplemental Balance Sheet Information [Abstract]

Prepaid expenses and other current assets



	September 30, 2019		December 31, 2018
Prepaid clinical, contract research and manufacturing costs	$	683	$	293
Prepaid insurance	24		353
Other	638		736
Prepaid expenses and other current assets	$	1,345	$	1,382

Property and equipment, net



	September 30, 2019			December 31, 2018
Scientific equipment	$	2,062		$	1,979
Leasehold improvements	192			192
Furniture and fixtures	41			41
Computers and software	26			26
Construction in process	730			12
Property and equipment, gross	3,051			2,250
Less: accumulated depreciation	(1,454		)	(1,189		)
Property and equipment, net	$	1,597		$	1,061

Depreciation and amortization expense was $91 and $90 for the three months ended September 30, 2019 and 2018, respectively, and $265 and $266, for the nine months ended September 30, 2019 and 2018, respectively.

Other noncurrent assets



	September 30, 2019		December 31, 2018
Operating lease asset	$	424	$	—
Other	32		32
Other noncurrent assets	$	456	$	32

Accrued expenses and other current liabilities



	September 30, 2019		December 31, 2018
Accrued payroll-related expenses	$	781	$	899
Accrued loan fees	100		231
Accrued legal expenses	255		189
Operating lease liability	279		—
Accrued clinical, contract research and manufacturing costs	244		102
Accrued other expenses	578		122
Accrued expenses and other current liabilities	$	2,237	$	1,543

Other noncurrent liabilities



	September 30, 2019		December 31, 2018
Operating lease liability	$	144	$	—
Other	—		39
Other noncurrent liabilities	$	144	$	39