Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 56,177	$ 39,179
Short-term investments	415,207	133,607
Accounts receivable, other	44	176
Accounts receivable from related party	58	0
Prepaid expenses and other current assets	2,956	1,400
Total current assets	474,442	174,362
Property and equipment, net	15,063	2,154
Long-term investments	14,456	29,454
Operating lease right-of-use assets	27,667	1,704
Other assets	1,414	1,409
Total assets	533,042	209,083
Current liabilities:
Accounts payable	8,868	1,532
Accrued and other current liabilities	18,938	19,806
Long-term debt, current	3,066	0
Other current liabilities to related party	6,173	0
Deferred revenue from related party	9,817	37,742
Total current liabilities	46,862	59,080
Long-term debt, net	21,260	19,786
Non-current deferred revenue from related party	24,814	63,095
Non-current lease liabilities	34,436	566
Other non-current liabilities	851	556
Total liabilities	128,223	143,083
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; 69,108,573 and 60,234,784 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	69	60
Additional paid-in capital	859,960	495,624
Note receivable	(16)	(16)
Accumulated other comprehensive income	272	318
Accumulated deficit	(455,466)	(429,986)
Total stockholders’ equity	404,819	66,000
Total liabilities and stockholders’ equity	$ 533,042	$ 209,083