Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents		$ 163,030	$ 180,002
Short term investments		18,311	110,704
Prepaid expenses and other current assets		13,423	12,922
Total current assets		194,764	303,628
Property and equipment, net		22,985	17,938
Operating lease assets		110,984	18,208
Restricted cash		8,185	8,000
Restricted investments		1,401	1,401
Long term investments		0	495
Other non-current assets		10,465	5,189
Total assets		348,784	354,859
Current liabilities:
Accounts payable		17,440	13,735
Accrued expenses and other current liabilities	[1]	59,840	45,094
Operating lease liabilities		3,601	6,610
Short term portion of note payable, net of discount		456	0
Deferred revenue - related party		4,259	16,819
Total current liabilities		85,596	82,258
Long term portion of note payable, net of discount		50,591	24,643
Operating lease liabilities, net of current portion		107,942	17,958
Deferred revenue, net of current portion - related party		92,430	86,998
Other long-term liabilities	[2]	1,442	11,495
Total liabilities		338,001	223,352
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at December 31, 2022 and 2021; no shares issued and outstanding at December 31, 2022 and 2021, respectively		0	0
Common stock, $0.001 par value; 200,000,000 shares authorized at December 31, 2022 and 2021; 125,222,273 and 91,889,418 shares issued and outstanding at December 31, 2022 and 2021, respectively		125	92
Additional paid-in capital		875,181	745,829
Accumulated other comprehensive loss		(12)	(60)
Accumulated deficit		(864,511)	(614,354)
Total stockholders' equity		10,783	131,507
Total liabilities and stockholders' equity		$ 348,784	$ 354,859

[1] Includes related party amounts of $34,770 and $21,098 at December 31, 2022 and December 31, 2021, respectively (see Note 11)

[2] Includes related party amounts of $0 and $10,585 at December 31, 2022 and December 31, 2021, respectively (see Note 11)