Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents		$ 58,849	$ 30,793
Accounts receivable due from SPN - related party		2,761	2,068
Prepaid expenses and other current assets	[1]	4,468	5,813
Total current assets		66,078	38,674
Property and equipment, net		10,547	11,534
Operating lease assets		78,858	80,903
Restricted cash		8,668	8,668
Other non-current assets		31	31
Total assets		164,182	139,810
Current liabilities:
Accounts payable		2,168	4,079
Accrued expenses and other current liabilities		6,220	10,719
Accrued liabilities due to SPN - related party		13,886	17,750
Operating lease liabilities		9,049	8,674
Total current liabilities		31,323	41,222
Operating lease liabilities, net of current portion		80,499	82,966
Other long-term liabilities		1,895	1,838
Total liabilities		113,717	126,026
Commitments and contingencies (Note 9)
Stockholders' equity (deficit):
Preferred stock, $0.001 par value; 10,000,000 shares authorized at March 31, 2025 and December 31, 2024; no shares issued and outstanding at March 31, 2025 and December 31, 2024		0	0
Common stock, $0.001 par value; 360,000,000 shares authorized at March 31, 2025 and December 31, 2024; 8,732,187 and 8,650,227 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively		9	9
Additional paid-in capital		995,873	991,874
Accumulated other comprehensive loss			0
Accumulated deficit		(945,417)	(978,099)
Total stockholders' equity		50,465	13,784
Total liabilities and stockholders' equity		$ 164,182	$ 139,810

[1] Includes $1,622 as of March 31, 2025 and $2,683 as of December 31, 2024 of unbilled receivable from SPN (related party) related to certain costs of the transition services performed by the Company. See Note 3, Discontinued Operations and TSA, for further details.