Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

As of September 30, 2018, and December 31, 2017, the Company’s financial assets recognized at fair value consisted of the following:

Description	Total		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	(in thousands)
September 30, 2018
Assets:
Cash Equivalents
Money market funds	$	3,933	$	3,933	$	—	$	—
Total	$	3,933	$	3,933	$	—	$	—
Liabilities:
Warrant liability	$	2,155	$	—	$	—	$	2,155
December 31, 2017
Assets:
Cash Equivalents
Money market funds	$	5,547	$	5,547	$	—	$	—
Marketable securities
Asset-backed securities	$	900	$	—	$	900	$	—
Liabilities:
Warrant liability	$	14,679	$	—	$	—	$	14,679

Schedule of Reconciliation of Liabilities Measured at Fair Value

The following table provides a reconciliation of all liabilities measured at fair value using Level 3 significant unobservable inputs:

		September 30, 2018
		(in thousands)
Beginning balance, December 31, 2017	$		14,679
Change in fair value of warrant liability			(12,524	)
Ending balance	$		2,155

Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash within the statement of financial position that sum to the total of the same such amounts shown in the statement of cash flows.

	As of September 30,
	2018		2017
	(in thousands)
Cash and cash equivalents	$	5,192	$	10,798
Restricted cash		137		137
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$	5,329	$	10,935