Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 54,311	$ 119,136
Available-for-sale securities	108,572	88,643
Prepaid expenses and other current assets	7,319	14,723
Restricted cash, current	237
Accounts receivable - related party		110
Total current assets	170,439	222,612
Property and equipment, net	6,847	6,462
Operating lease, right-of-use assets	28,939	1,142
Other non-current assets	438	94
Restricted cash	1,833	2,070
Total assets	208,496	232,380
Current liabilities:
Accounts payable	5,109	4,463
Accrued expenses	16,141	9,528
Operating lease liabilities	33	1,263
Finance lease liabilities	412	232
Other current liabilities	23	35
Deferred revenue - related party		8,080
Total current liabilities	21,718	23,601
Operating lease liabilities, excluding current portion	24,543	275
Finance lease liabilities, excluding current portion		293
Total liabilities	46,261	24,169
Commitments and contingencies
Preferred stock, $0.001 par value; 10,000,000 shares authorized at June 30, 2022 and December 31, 2021; no shares issued and outstanding at June 30, 2022 and December 31, 2021
Common stock, $0.001 par value; 300,000,000 shares authorized at June 30, 2022 and December 31, 2021; 112,964,698 shares issued and outstanding at June 30, 2022 and 110,340,281 shares issued and outstanding at December 31, 2021; no pre-funded warrants outstanding at June 30, 2022 and 2,158,329 pre-funded warrants outstanding at December 31, 2021	112	112
Additional paid-in capital	689,422	684,901
Accumulated other comprehensive loss	(122)	(45)
Accumulated deficit	(527,177)	(476,757)
Total stockholders’ equity	162,235	208,211
Total liabilities and stockholders’ equity	$ 208,496	$ 232,380