Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (6,248)	$ (5,633)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	51	61
Non-cash lease expense	82	0
Non-cash stock-based compensation	269	117
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(330)	(113)
Accounts payable	306	(20)
Accrued expenses and other liabilities	(151)	(186)
Lease Liability	(78)	0
Net cash used in operating activities	(6,099)	(5,774)
Cash flows from investing activities:
Cash paid for purchase of property and equipment	(77)	0
Net cash used in investing activities	(77)	0
Cash flows from financing activities:
Net proceeds from the issuance of common stock and/or warrants	0	5,432
Financing costs from the issuance of common stock under Lincoln Park Capital, LLC purchase agreement	(52)	0
Payment of taxes for net share settled restricted stock unit issuances	(3)	0
Proceeds from the exercise of pre-funded warrants	60	0
Proceeds from the issuance of common stock in connection with the employee stock purchase plan	1	1
Net cash provided by financing activities	6	5,433
Net decrease in cash and restricted cash	(6,170)	(341)
Cash and restricted cash at the beginning of period	14,929	3,631
Cash and restricted cash at the end of period	8,759	3,290
Supplemental disclosure of non-cash investing and financing activities:
Right of use asset	620	0
Purchase of property and equipment through short-term financing lease included in accrued expenses and other current liabilities	$ 33	$ 0