CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flow from operating activities
Net loss	$ (8,332)	$ (6,210)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation	432	522
Amortization of right of use assets	58	75
Depreciation	54	116
(Increase) decrease in operating assets
Prepaid drug product for testing	(204)	(433)
Other current assets	(489)	64
Increase (decrease) in operating liabilities
Accounts payable and accrued expenses	176	(187)
Lease liabilities	(63)	(63)
Net cash used in operating activities	(8,368)	(6,116)
Cash flow from financing activities
Net proceeds from sale of common stock	0	19,411
Net proceeds from exercise of warrants	0	1,083
Net cash provided by financing activities	0	20,494
Net (decrease) increase in cash	(8,368)	14,378
Cash, beginning of period	20,426	1,004
Cash, end of period	12,058	15,382
Non-cash investing activities
Non-cash leasehold improvements	$ 0	$ (31)