Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 333,205	$ 39,179
Short-term investments	171,415	133,607
Accounts receivable, other	156	176
Accounts receivable from related party	72	0
Prepaid expenses and other current assets	2,385	1,400
Total current assets	507,233	174,362
Property and equipment, net	5,569	2,154
Long-term investments	0	29,454
Operating lease right-of-use assets	28,087	1,704
Other assets	1,155	1,409
Total assets	542,044	209,083
Current liabilities:
Accounts payable	3,409	1,532
Accrued and other current liabilities	19,279	19,806
Other current liabilities to related party	6,173	0
Deferred revenue from related party	27,504	37,742
Total current liabilities	56,365	59,080
Long-term debt, net	24,252	19,786
Non-current deferred revenue from related party	12,094	63,095
Non-current lease liabilities	27,446	566
Other non-current liabilities	746	556
Total liabilities	120,903	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; 68,803,400 and 60,234,784 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	69	60
Additional paid-in capital	852,006	495,624
Note receivable	(16)	(16)
Accumulated other comprehensive income	488	318
Accumulated deficit	(431,406)	(429,986)
Total stockholders’ equity	421,141	66,000
Total liabilities and stockholders’ equity	$ 542,044	$ 209,083