Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Cash and Cash Equivalents

Cash and cash equivalents consist of the following:

	December 31,
	2017		2016
	(in thousands)
Cash	$	556	$	1,964
Cash equivalents:
Money market accounts		99,792		107,043
Total cash and cash equivalents	$	100,348	$	109,007

Summary of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

	December 31,
	2017		2016
	(in thousands)
Prepaid research and development project costs	$	549	$	515
Prepaid insurance		478		511
Other receivables		103		70
Other		247		247
Total prepaid expenses and other current assets	$	1,377	$	1,343

Summary of Property and Equipment, Net

Property and equipment, net consists of the following:

	December 31,
	2017			2016
	(in thousands)
Software	$	254		$	242
Computer equipment		93			255
Leasehold improvements		79			110
Furniture and fixtures		3			45
Property and equipment, gross		429			652
Less: accumulated depreciation		(275	)		(252	)
Total property and equipment, net	$	154		$	400

Summary of Accrued Liabilities

Accrued liabilities consist of the following:

	December 31,
	2017		2016
	(in thousands)
Accrued research and development costs	$	2,763	$	1,600
Accrued employee related costs		2,699		2,084
Accrued professional fees		317		381
Accrued restructuring costs (Note 12)		137		763
Other		217		293
Total accrued liabilities	$	6,133	$	5,121