CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 43,162	$ 108,382
Short-term investments	157,912	47,491
Assets held for sale		28,907
Prepaid expenses and other current assets	12,130	7,129
Total current assets	213,204	191,909
Equity method investment	27,132
Property and equipment, net	1,415	2,252
Right-of-use assets	20,900	15,607
Restricted cash	0	1,953
Total assets	262,651	211,721
Current liabilities:
Accounts payable	4,835	2,366
Accrued expenses and other liabilities	16,970	11,406
Operating lease liabilities	1,489	246
Deferred revenue	1,958	3,208
Total current liabilities	25,252	17,226
Non-current liabilities:
Operating lease liabilities, net of current portion	28,338	23,688
Deferred revenue, net of current portion		1,156
Total liabilities	53,590	42,070
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized; no shares issued and outstanding at September 30, 2022 and December 31, 2021
Common stock, $0.0001 par value; 200,000,000 shares authorized; 57,480,610 and 57,150,274 shares issued and outstanding as of September 30, 2022 and December 31, 2021, respectively	6	6
Additional paid-in capital	604,354	593,784
Accumulated other comprehensive loss	(457)	(7)
Accumulated deficit	(394,842)	(424,132)
Total stockholders’ equity	209,061	169,651
Total liabilities and stockholders' equity	$ 262,651	$ 211,721