CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 176,188	$ 108,382
Short-term investments	49,335	47,491
Assets held for sale		28,907
Prepaid expenses and other current assets	12,917	7,129
Total current assets	238,440	191,909
Equity method investment	29,298
Property and equipment, net	1,720	2,252
Right-of-use assets	15,151	15,607
Restricted cash	0	1,953
Total assets	284,609	211,721
Current liabilities:
Accounts payable	3,762	2,366
Accrued expenses and other liabilities	12,940	11,406
Accrued income taxes	862
Operating lease liabilities	410	246
Deferred revenue	2,760	3,208
Total current liabilities	20,734	17,226
Non-current liabilities:
Operating lease liabilities, net of current portion	23,587	23,688
Deferred revenue, net of current portion		1,156
Total liabilities	44,321	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 June 30, 2022 and December 31, 2021
Common stock, $0.0001 par value; 200,000,000 shares authorized; 57,385,578 and 57,150,274 shares issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	6	6
Additional paid-in capital	601,439	593,784
Accumulated other comprehensive loss	(41)	(7)
Accumulated deficit	(361,116)	(424,132)
Total stockholders’ equity	240,288	169,651
Total liabilities and stockholders' equity	$ 284,609	$ 211,721