Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 40,577	$ 49,978
Short-term investments	300,024	214,514
Accounts receivable, net	2,781	411
Accounts receivable from related party	29	43
Inventory	2,897	851
Prepaid expenses and other current assets	5,324	3,380
Total current assets	351,632	269,177
Property and equipment, net	31,482	32,269
Long-term investments	31,235	97,856
Operating lease right-of-use assets	24,592	24,806
Other assets	1,512	1,544
Total assets	440,453	425,652
Current liabilities:
Accounts payable	5,423	6,746
Accrued and other current liabilities	25,547	26,358
Long-term debt, current	19,128	18,920
Deferred revenue from related party	18,709	10,993
Total current liabilities	68,807	63,017
Long-term debt, net	4,554	4,715
Non-current deferred revenue from related party	62,094	24,772
Non-current lease liabilities	46,062	46,830
Other non-current liabilities	217	198
Total liabilities	181,734	139,532
Commitments (Note 7)
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value, 200,000,000 shares authorized; 71,142,102 and 70,357,557 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	71	70
Additional paid-in capital	916,224	903,646
Note receivable	(16)	(16)
Accumulated other comprehensive loss	(1,855)	(483)
Accumulated deficit	(655,705)	(617,097)
Total stockholders’ equity	258,719	286,120
Total liabilities and stockholders’ equity	$ 440,453	$ 425,652