Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net loss	$ (17,333)	$ (8,038)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	32	35
Loss on disposal of leasehold improvements		2
Stock-based compensation expense	388	124
Non-cash interest expense	6,173	683
Re-measurement of derivative liabilities	1,683	(18)
Changes in operating assets and liabilities:
Accounts receivable		40
Prepaid expenses and other current assets	(700)	(265)
Accounts payable	(414)	(141)
Accrued expenses	(441)	265
Deferred revenue		(11)
Net cash used in operating activities	(10,612)	(7,324)
Investing activities
Purchases of property and equipment	(11)	(3)
Net cash used in investing activities	(11)	(3)
Financing activities
Proceeds from issuance of common stock, net of issuance costs		6,434
Debt issuance costs	(87)	(85)
Proceeds from exercise of related party warrants	5,403
Proceeds from short term and long term debt, related party	4,000	1,750
Net cash provided by financing activities	9,316	8,099
Net increase (decrease) in cash and cash equivalents	(1,307)	772
Cash, cash equivalents and restricted cash at beginning of year	3,836	3,064
Cash, cash equivalents and restricted cash at end of year	2,529	3,836
Supplemental cash flow disclosures
Income taxes paid	45	12
Beneficial conversion feature discount associated with 2018 Note		1,007
Relative fair value of warrant issued with 2018 Note		743
Beneficial conversion feature discount associated with 2017 Note modification		40
Interest paid	394
Right-of-use asset obtained in exchange for lease liability	463
Conversion of notes payable to related party into common stock	6,004
Reclassification of warrant from derivative liabilities to additional paid-in capital	5,785
Fair value of warrants issued with Notes to Related Party	$ 4,061