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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (6,187)	$ (4,226)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	675	760
Depreciation and amortization	48	7
(Gain) loss on disposal of fixed assets	3	0
Accretion on marketable securities	(167)	515
Changes in operating assets and liabilities:
Prepaid and other current assets	(1,652)	(969)
Other assets	167	57
Accounts payable, accrued liabilities and other liabilities	(1,083)	(1,786)
Net cash used in operating activities	(8,196)	(5,642)
Cash flows from investing activities:
Purchase of marketable securities	(30,121)	(26,546)
Sale of marketable securities	34,410	20,456
Net cash provided by (used in) investing activities	4,289	(6,090)
Cash flows from financing activities:
Tax withholding payments on net share settlement equity awards	(85)	(168)
Net cash used in financing activities	(85)	(168)
Effect of exchange rate changes on cash	(7)	0
Net decrease in cash and cash equivalents	(3,999)	(11,900)
Cash and cash equivalents at beginning of period	32,154	24,647
Cash and cash equivalents at end of period	$ 28,155	$ 12,747

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