BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 37,807	$ 76,054
Restricted cash	13,938	0
Receivables	2,911	1,111
Prepaid expenses and other current assets	849	1,666
Total current assets	55,505	78,831
Property and equipment, net	9,050	10,941
Right of use asset	2,247	4,420
Deposits	42	42
Other non-current assets	500	631
Total assets	67,344	94,865
Current liabilities:
Accounts payable	1,984	1,368
Current portion of long-term debt	22,668	7,868
Accrued expenses	7,675	6,076
Lease liability, current	542	729
Total current liabilities	32,869	16,041
Long-term debt	0	16,250
Lease liability, non-current	2,334	4,518
Other non-current liabilities	28	0
Total liabilities	35,231	36,809
Commitments and contingencies (Note 9)
Stockholders' equity
Common stock $0.001 par value; 420,000,000 shares authorized, 216,182,042 shares issued and outstanding at September 30, 2022 and 350,000,000 shares authorized, 216,127,443 shares issued and outstanding at December 31, 2021	216	216
Additional paid-in capital	903,365	900,693
Accumulated deficit	(871,468)	(842,852)
Total stockholders' equity	32,113	58,057
Total liabilities and stockholders' equity	$ 67,344	$ 94,865