Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 35,276	$ 55,904
Investments	295,037	317,271
Prepaid expenses and other current assets	14,846	5,047
Total current assets	345,159	378,222
Property and equipment, net	39,337	39,172
Goodwill	39,154	39,154
Intangible assets	25,150	25,150
Restricted cash	1,362	1,372
Deposits	533	533
Investments	0	34,320
Operating lease right-of-use assets, net	4,768	3,901
Finance lease right-of-use asset, net	43,979	44,517
Total assets	499,442	566,341
Current liabilities:
Accounts payable and accrued expenses	30,085	45,789
Operating lease liabilities, current	1,064	925
Finance lease liability, current	1,808	1,791
Total current liabilities	32,957	48,505
Operating lease liabilities, non-current	3,714	2,973
Finance lease liability, non-current	19,363	19,353
Other liabilities	1,906	2,936
Total liabilities	57,940	73,767
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock, $0.01 par value, 120,000,000 shares authorized; 90,646,590 and 90,282,267 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively	906	903
Additional paid-in capital	1,462,155	1,450,722
Accumulated other comprehensive income (loss)	(135)	319
Accumulated deficit	(1,021,424)	(959,370)
Total stockholders' equity	441,502	492,574
Total liabilities and stockholders' equity	499,442	566,341
Series A Convertible Preferred Shares
Stockholders' equity:
Preferred stock
Series B Convertible Preferred Shares
Stockholders' equity:
Preferred stock