CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net loss	$ (27,204)	$ (40,391)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	757	348
Amortization (accretion) on marketable securities	0	(182)
Non-cash interest expense	57	54
Non-cash lease expense	229	265
Non-cash (income) expense from collaborative arrangements, net	1,745	1,392
Stock-based compensation expense	3,659	5,321
Impairment of advance for COVAXIN supply	0	4,074
Loss on disposal of fixed assets related to COVAXIN	0	363
Other	19	439
Changes in assets and liabilities:
Prepaid expenses and other current assets	567	572
Accounts payable and accrued expenses	(113)	(9,049)
Lease obligations	(222)	(252)
Net cash used in operating activities	(20,506)	(37,046)
Cash flows from investing activities
Purchases of marketable securities	0	(3,947)
Proceeds from the maturities of marketable securities	0	17,500
Purchases of property and equipment	(2,865)	(4,389)
Net cash (used in) provided by investing activities	(2,865)	9,164
Cash flows from financing activities
(Payments) from issuance of common stock, net	(100)
Proceeds from issuance of common stock, net		20,690
Payment of equity issuance costs	0	(222)
Proceeds from issuance of debt	0	500
Payment of debt issuance costs	0	(68)
Net cash (used in) provided by financing activities	(100)	20,900
Effect of changes in exchange rate on cash, cash equivalents, and restricted cash	8	(3)
Net (decrease) in cash, cash equivalents, and restricted cash	(23,463)	(6,985)
Cash, cash equivalents, and restricted cash at beginning of period	39,462	77,563
Cash, cash equivalents, and restricted cash at end of period	15,999	70,578
Supplemental disclosure of non-cash investing and financing transactions:
Equity issuance costs	0	133
Purchases of property and equipment	246	2,637
Series B Convertible Preferred Stock redemption	1	0
Right-of-use asset related to operating leases	$ 103	$ 0