CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (10,376)	$ (9,134)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	4	7
Amortization of contract asset		34
Change in right-of-use asset	104	95
Stock-based compensation expense	1,204	833
Foreign currency (gain) loss	(235)	21
Changes in operating assets and liabilities:
Prepaid expenses and other assets	277	(133)
Research and development incentive receivable	(38)	(20)
Accounts payable and accrued expenses	(2,368)	387
Deferred revenue		(375)
Restricted stock liability		(204)
Lease liability	(106)	(98)
Other assets	16
Net cash used in operating activities	(11,518)	(8,587)
Cash flows from financing activities:
Proceeds from the exercise of common stock warrants		14
Payment of deferred offering costs	(210)
Net cash provided by (used in) financing activities	(210)	14
Effect of exchange rate changes on cash and cash equivalents	32	(7)
Net decrease in cash and cash equivalents	(11,696)	(8,580)
Cash and cash equivalents at beginning of period	114,916	52,071
Cash and cash equivalents at end of period	$ 103,220	$ 43,491