Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets (in thousands)

	December 31,
	2017		2016
Preclinical and clinical	$	261	$	3,474
Other		301		678
Total	$	562	$	4,152

Property and Equipment, Net

Property and equipment, net (in thousands)

	December 31,
	2017			2016
Equipment and furniture	$	1,409		$	664
Buildings, leasehold and building improvements		134			134
		1,543			798
Less: Accumulated depreciation and amortization		(745	)		(533	)
Property and equipment, net	$	798		$	265

Build-to-Suit Lease Asset, Net

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

	December 31,
	2017			2016
Build-to-suit lease asset	$	8,986		$	—
		8,986			—
Less: Accumulated depreciation and amortization		(98	)		—
Build-to-suit lease asset, net	$	8,888		$	—

Accrued Liabilities

Accrued liabilities (in thousands)

	December 31,
	2017		2016
Payroll and related	$	2,058	$	3,818
Preclinical and clinical		1,694		8,803
Professional services		204		114
Other		137		164
Total	$	4,093	$	12,899