Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 63,161	$ 75,150
Restricted cash	180	305
Accounts receivable	144	300
Prepaid expenses and other current assets	1,513	2,275
Total current assets	64,998	78,030
Property and equipment, net	835	680
Operating lease right-of-use asset	1,442	1,577
Prepaid expenses and other long-term assets	90	96
Total assets	67,365	80,383
Current liabilities:
Accounts payable	1,101	1,285
Accrued expenses and other current liabilities	1,794	3,326
Deferred revenue	38	100
Operating lease liability	779	756
Note payable, short term	7,500	7,500
Total current liabilities	11,212	12,967
Note payable, long term	1,671	3,445
Operating lease liability, net of current portion	1,528	1,730
Corporate bond, net of bond discount	2,115	2,054
Earn-out liabilities	608	1,632
Other long-term liabilities	23	23
Total liabilities	17,157	21,851
Commitments and contingencies
Stockholders' equity
Common stock, $0.0001 par value: 1,000,000,000 shares authorized; 78,684,864 and 78,356,527 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively	8	8
Additional paid-in capital	359,744	358,305
Accumulated deficit	(309,544)	(299,781)
Total stockholders' equity	50,208	58,532
Total liabilities and stockholders' equity	$ 67,365	$ 80,383