Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 38,607	$ 55,904
Investments	240,218	317,271
Prepaid expenses and other current assets	13,900	5,047
Total current assets	292,725	378,222
Property and equipment, net	39,548	39,172
Goodwill	39,154	39,154
Intangible assets	25,150	25,150
Restricted cash	1,362	1,372
Deposits	481	533
Investments	0	34,320
Operating lease right-of-use assets, net	4,551	3,901
Finance lease right-of-use asset, net	43,440	44,517
Total assets	446,411	566,341
Current liabilities:
Accounts payable and accrued expenses	34,733	45,789
Operating lease liabilities, current	1,033	925
Finance lease liability, current	1,826	1,791
Total current liabilities	37,592	48,505
Operating lease liabilities, non-current	3,565	2,973
Finance lease liability, non-current	19,374	19,353
Other liabilities	1,245	2,936
Total liabilities	61,776	73,767
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock, $0.01 par value, 180,000,000 shares authorized; 90,956,613 and 90,282,267 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively	910	903
Additional paid-in capital	1,475,013	1,450,722
Accumulated other comprehensive income (loss)	(218)	319
Accumulated deficit	(1,091,070)	(959,370)
Total stockholders' equity	384,635	492,574
Total liabilities and stockholders' equity	446,411	566,341
Series A Convertible Preferred Shares
Stockholders' equity:
Preferred stock
Series B Convertible Preferred Shares
Stockholders' equity:
Preferred stock