Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Cash and Cash Equivalents

Cash and cash equivalents consist of the following:

	June 30, 2018		December 31, 2017
	(in thousands)
Cash	$	992	$	556
Cash equivalents:
Money market accounts		124,433		99,792
Total cash and cash equivalents	$	125,425	$	100,348

Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the condensed consolidated balance sheets to the amounts shown in the condensed consolidated statements of cash flows.

	June 30, 2018		June 30, 2017
	(in thousands)
Cash and cash equivalents	$	125,425	$	116,699
Restricted cash included in other assets		300		187
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statement of cash flows	$	125,725	$	116,886

Summary of Prepaid Expenses and Other Current Assets

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

	June 30, 2018		December 31, 2017
	(in thousands)
Prepaid research and development project costs	$	1,330	$	549
Income taxes receivable		378		—
Other receivables		343		103
Prepaid insurance		99		478
Other		273		247
Total prepaid expenses and other current assets	$	2,423	$	1,377

Summary of Property and Equipment, Net

Property and equipment, net consists of the following:

	June 30, 2018			December 31, 2017
	(in thousands)
Software	$	264		$	254
Computer equipment		89			93
Leasehold improvements		79			79
Furniture and fixtures		3			3
Property and equipment, gross		435			429
Less: accumulated depreciation		(314	)		(275	)
Total property and equipment, net	$	121		$	154

Summary of Accrued Liabilities

Accrued liabilities consist of the following:

	June 30, 2018		December 31, 2017
	(in thousands)
Accrued research and development costs	$	3,666	$	2,763
Accrued employee-related costs		1,539		2,699
Accrued professional fees		1,014		317
Accrued restructuring costs (Note 10)		86		137
Other		469		217
Total accrued liabilities	$	6,774	$	6,133