Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents		$ 126,824	$ 180,002
Short term investments		68,971	110,704
Prepaid expenses and other current assets		13,785	12,922
Total current assets		209,580	303,628
Property and equipment, net		19,520	17,938
Operating lease assets		25,001	18,208
Restricted cash		8,185	8,000
Restricted investments		1,401	1,401
Long term investments		0	495
Other non-current assets		9,509	5,189
Total assets		273,196	354,859
Current liabilities:
Accounts payable		13,992	13,735
Accrued expenses and other current liabilities	[1]	56,889	45,094
Operating lease liabilities		7,058	6,610
Deferred revenue - related party		11,098	16,819
Total current liabilities		89,037	82,258
Long term portion of note payable, net of discount		50,632	24,643
Operating lease liabilities, net of current portion		19,516	17,958
Deferred revenue, net of current portion - related party		90,010	86,998
Other long-term liabilities	[2]	943	11,495
Total liabilities		250,138	223,352
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at June 30, 2022 and December 31, 2021; no shares issued and outstanding at June 30, 2022 and December 31, 2021		0	0
Common stock, $0.001 par value; 200,000,000 shares authorized at June 30, 2022 and December 31, 2021; 91,841,974 and 91,459,239 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively		92	92
Additional paid-in capital		758,935	745,829
Accumulated other comprehensive income (loss)		(256)	(60)
Accumulated deficit		(735,713)	(614,354)
Total stockholders’ equity		23,058	131,507
Total liabilities and stockholders’ equity		$ 273,196	$ 354,859

[1] Includes related party amounts of $33,062 and $21,098 at June 30, 2022 and December 31, 2021, respectively (see Note 11)

[2] Includes related party amounts of $0 and $10,585 at June 30, 2022 and December 31, 2021, respectively (see Note 11)