Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 289,486	$ 389,705
Accounts receivable	359	92
Prepaid expenses and other current assets	5,516	20,690
Short-term investments	144,465	201,881
Total current assets	439,826	612,368
Property and equipment, net	2,820	1,171
Operating lease right-of-use assets	8,474	5,055
Intangible assets, net	259	332
Other assets	920	193
Long-term investments	154,981	35,970
Total assets	607,280	655,089
Current liabilities:
Accounts payable	7,527	1,890
Current portion of operating lease liabilities	827	734
Accrued expenses and other current liabilities	7,623	6,313
Total current liabilities	15,977	8,937
Operating lease liabilities, net of current portion	8,749	5,076
Debt, net of current portion	0	908
Total liabilities	24,726	14,921
Stockholders’ Equity:
Common stock, $0.0001 par value; 250,000,000 shares authorized; 173,120,988 and 169,316,421 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	20	19
Additional paid-in capital	373,804	364,998
Retained earnings	208,730	275,151
Total stockholders’ equity	582,554	640,168
Total liabilities and stockholders’ equity	$ 607,280	$ 655,089