Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net loss	$ (40,420)	$ (65,952)
Adjustments to reconcile net loss to net cash used in operating activities:
Loss on impairment of goodwill		29,517
Stock based compensation	6,092	6,688
Operating lease right-of-use asset	1,013	1,366
Depreciation	341	248
Amortization of premium (Accretion of discount) on marketable debt securities	(444)	1,137
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(1,265)	265
Other assets	(2,300)	222
Accounts payable	848	631
Accrued expenses	(505)	748
Operating lease liabilities	(917)	(1,327)
Net cash provided by (used in) operating activities	(37,557)	(26,457)
Cash flows from investing activities:
Purchase of marketable debt securities	(12,186)	(43,550)
Proceeds from maturity and redemption of marketable debt securities	65,338	58,620
Purchase of property and equipment	(45)	(120)
Net cash provided by (used in) investing activities	53,107	14,950
Cash flows from financing activities:
Repurchase of shares in connection with settlement of RSUs	(91)	(90)
Net cash provided by (used in) financing activities	(91)	(90)
Net increase (decrease) in cash and cash equivalents and restricted cash	15,459	(11,597)
Cash and cash equivalents and restricted cash - beginning of year	24,872	36,469
Cash and cash equivalents and restricted cash - end of year	40,331	24,872
Cash paid for:
Interest
Income taxes