Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets (in thousands)

	December 31,
	2018		2017
Preclinical and clinical	$	416	$	261
Lease receivable		606		—
Other		16		301
Total	$	1,038	$	562

Property and Equipment, Net

Property and equipment, net (in thousands)

	December 31,
	2018			2017
Equipment and furniture	$	1,442		$	1,409
Buildings, leasehold and building improvements		134			134
		1,576			1,543
Less: Accumulated depreciation and amortization		(1,544	)		(745	)
Property and equipment, net	$	32		$	798

Intangible Asset, Net

Intangible asset, net (in thousands)

	December 31,
	2018			2017
Assembled workforce	$	366		$	—
		366			—
Less: Accumulated amortization		(25	)		—
Intangible asset, net	$	341		$	—

Build-to-Suit Lease Asset, Net

Build-to-suit lease asset, net (in thousands)

	December 31,
	2018			2017
Build-to-suit lease asset	$	8,986		$	8,986
		8,986			8,986
Less: Accumulated depreciation and amortization		(335	)		(98	)
Build-to-suit lease asset, net	$	8,651		$	8,888

Accrued Liabilities

Accrued liabilities (in thousands)

	December 31,
	2018		2017
Payroll and related	$	509	$	2,058
Preclinical and clinical		563		1,694
Professional services		—		204
Other		293		137
Total	$	1,365	$	4,093