CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flow from operating activities
Net loss	$ (10,882)	$ (8,599)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation	577	684
Amortization of right of use assets	79	96
Depreciation	72	134
(Increase) decrease in operating assets
Prepaid drug product	(497)	(444)
Other current assets	(140)	15
Increase (decrease) in operating liabilities
Accounts payable and accrued expenses	(84)	(168)
Lease liabilities	(85)	(79)
Net cash used in operating activities	(10,960)	(8,361)
Cash flow from financing activities
Net proceeds from sale of common stock	4,289	26,700
Net proceeds from exercise of warrants		1,083
Net cash provided by financing activities	4,289	27,783
Net (decrease) increase in cash	(6,671)	19,422
Cash, beginning of period	20,426	1,004
Cash, end of period	$ 13,755	20,426
Non-cash investing activities
Non-cash leasehold improvements		$ 31