CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (42,554)	$ (39,948)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property and equipment	46	45
Amortization of debt issuance costs	146	132
Amortization of discount/premium on investments	(2,340)	(4,002)
Share-based compensation	4,942	7,324
Lease-related amortization	(54)	(43)
Changes in operating assets and liabilities:
Accounts receivable	(125)	1,014
Prepaid expenses and other assets	1,115	4,019
Accounts payable and accrued liabilities	3,623	(5,108)
Net cash used in operating activities	(35,201)	(36,567)
Cash flows from investing activities:
Purchases of property and equipment	(98)	(74)
Purchases of short-term investments	(21,680)	(30,347)
Purchases of long-term investments	(43,680)	(15,208)
Proceeds from maturities of short-term investments	88,490	76,285
Net cash provided by investing activities	23,032	30,656
Cash flows from financing activities:
Proceeds from exercise of stock options	2	0
Proceeds from employee stock purchase plan	378	356
Payments of debt issuance costs	(214)	(188)
Net cash provided by financing activities	166	168
Net decrease in cash and cash equivalents	(12,003)	(5,743)
Cash and cash equivalents:
Beginning of period	27,661	25,842
End of period	$ 15,658	$ 20,099