Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net loss	$ (5,879)	$ (7,755)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		19
Noncash interest expense	651	422
Stock based compensation expense	1,426	3,455
Issuance of common stock for payment of accrued compensation	90
Issuance of common stock in exchange for services	68	51
Changes in operating assets and liabilities:
Prepaid expenses and other assets	60	149
Accounts payable	717	(88)
Accrued Expenses	594	16
Net cash used in operating activities	(2,273)	(3,731)
Financing activities:
Net proceeds from issuance of common stock		2,781
Net proceeds from term loan		50
Proceeds from exercise of stock options	325
Net proceeds from issuance of convertible notes	1,275
Net proceeds from issuance of advance notes	950	400
Net cash provided by financing activities	2,550	3,231
Net increase (decrease) in cash, cash equivalents and restricted cash	277	(500)
Cash, cash equivalents and restricted cash, beginning of period	885	838
Cash, cash equivalents and restricted cash, end of period	1,162	338
Supplemental cash flow disclosure:
Cash paid for interest	8	3
Supplemental disclosure of non-cash investing and financing activities:
Conversion of notes payable and related accrued interest and fees to common stock	981	18,432
Beneficial conversion feature of Convertible notes	142
Issuance of stock options in lieu of cash compensation	195	303
Issuance of common stock for payment of accrued compensation	90
Issuance of common stock in exchange for services	$ 68	$ 31