CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 897	$ 2,118
Accounts receivable	15	0
Insurance receivable	408	100
Prepaids and other current assets	4,839	8,513
Total current assets	6,159	10,731
Property, machinery and equipment, net	2,837	3,252
Intangible assets, net	279	341
Operating right-of-use asset	4,780	5,350
Restricted cash, non-current	380	373
Other non-current assets	571	602
Total assets	15,006	20,649
Current liabilities:
Accounts payable	3,610	2,805
Accrued liabilities	5,186	4,754
Loan payable, current	350	2,273
Contract liabilities, current	495	0
Operating lease liability, current	1,328	1,268
Litigation settlement contingency	526	0
Other current liabilities	6	9
Total current liabilities	11,501	11,109
Contract liabilities, non-current	618	998
Warrant liability	3	3
Operating lease liability, non-current	4,178	4,863
Other non-current liabilities	502	489
Total non-current liabilities	5,301	6,353
Total liabilities	16,802	17,462
Commitments and Contingencies (Note 12)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 20,000,000 shares authorized and 0 issued and outstanding as of June 30, 2024 and December 31, 2023, respectively	0	0
Additional paid-in capital	386,580	376,234
Accumulated deficit	(388,376)	(373,047)
Total stockholders’ equity (deficit)	(1,796)	3,187
Total liabilities and stockholders’ equity	15,006	20,649
Common Class A
Stockholders’ equity:
Common stock, value	0	0
Common Class B
Stockholders’ equity:
Common stock, value	$ 0	$ 0