CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (19,430)	$ (14,864)
Adjustments to reconcile net loss to net cash used in operating activities:
Change in fair value of contingent consideration liability	(1,780)	880
Stock-based compensation expense	2,033	1,218
Depreciation and amortization	119	74
Unrealized (gains) losses on foreign currency exchange	(110)	33
Changes in operating assets and liabilities:
Accounts receivable	236	(191)
Prepaid expenses and other current assets	3,046	(4,201)
Accounts payable	171	(194)
Accrued expenses and other liabilities	2,659	(2,189)
Income tax and R&D incentive receivables	(470)	(135)
Net cash used in operating activities	(13,526)	(19,569)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales and maturities of short-term investments		30,912
Purchases of short-term investments		(7,476)
Purchases of property and equipment, net	(9)	(4,209)
Cash paid for internally developed patents		(62)
Net cash (used in) provided by investing activities	(9)	19,165
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of deferred offering costs	(119)	135
Proceeds from issuance of common stock in at-the-market offerings, net	2,990	34,178
Proceeds from issuance of common stock from Employee Stock Purchase Plan	113	106
Proceeds from exercises of stock options	197
Net cash provided by financing activities	3,181	34,419
Net (decrease) increase in cash and cash equivalents and restricted cash	(10,354)	34,015
Cash, cash equivalents and restricted cash at beginning of period	190,335	115,952
Cash, cash equivalents and restricted cash at end of period	$ 179,981	149,967
SUPPLEMENTAL NON-CASH ACTIVITIES:
Fair value of common stock retired in exchange for issuance of common stock warrant		$ 17,200