Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Cash flows used in operating activities:
Net loss	$ (7,691)	$ (10,777)	$ (26,985)	$ (37,024)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation			5,258	8,454
Operating lease right-of-use asset			1,024	712
Depreciation			173	63
Amortization of premium on marketable debt securities			1,029	1,280
Changes in operating assets and liabilities:
Prepaid expenses and other current assets			(433)	(605)
Other assets			131	213
Accounts payable			(498)	14
Accrued expenses			(135)	5
Operating lease liabilities			(995)	(707)
Net cash used in operating activities			(21,431)	(27,595)
Cash flows from investing activities:
Purchase of marketable debt securities			(14,428)	(115,959)
Proceeds from maturity and redemption of marketable debt securities			47,837	16,428
Purchase of property and equipment			(114)	(552)
Net cash provided by/(used in) investing activities			33,295	(100,083)
Cash flows from financing activities:
Repurchase of shares in connection with settlement of RSUs			(90)	(228)
Net cash used in financing activities			(90)	(228)
Net decrease in cash and cash equivalents and restricted cash			11,774	(127,906)
Cash and cash equivalents and restricted cash - beginning of year			36,469	169,393
Cash and cash equivalents and restricted cash - end of period	48,243	41,487	48,243	41,487
Reconciliation of cash and cash equivalents and restricted cash to the condensed consolidated balance sheets:
Cash and cash equivalents	47,498	40,742	47,498	40,742
Restricted cash
Restricted cash, non-current	745	745	745	745
Cash and cash equivalents and restricted cash	$ 48,243	$ 41,487	$ 48,243	$ 41,487