Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (8,794)	$ (8,908)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	72	67
Non-cash lease expense	111	109
Non-cash stock-based compensation expense	136	300
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(554)	(113)
Accounts payable	(81)	259
Accrued expenses and other liabilities	415	(257)
Lease Liability	(107)	(102)
Net cash used in operating activities	(8,802)	(8,645)
Cash flows from investing activities:
Cash paid for purchase of property and equipment	(19)	(72)
Net cash used in investing activities	(19)	(72)
Cash flows from financing activities:
Net proceeds from the issuance of common stock and warrants	12,087	708
Net proceeds from the exercise of warrants	3,856	72
Cash paid in lieu of fractional shares for 1:55 reverse stock split	(15)	0
Payment of taxes for net share settled restricted stock unit issuances	(2)	(3)
Proceeds from debt	231	0
Proceeds from the issuance of common stock in connection with the employee stock purchase plan	1	1
Payments for capital lease obligations less than one year	(27)	(6)
Net cash provided by financing activities	16,131	772
Net (decrease) increase in cash and restricted cash	7,310	(7,945)
Cash and restricted cash at the beginning of period	6,984	14,929
Cash and restricted cash at the end of period	14,294	6,984
Supplemental disclosure of cash flow information:
Interest paid	6	5
Supplemental disclosure of non-cash investing and financing activities:
Right of use asset obtained in exchange for operating lease liability	0	620
Purchase of property and equipment through short-term financing lease included in accrued expenses and other current liabilities	$ 0	$ 33