CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 193,513	$ 291,049
Accounts receivable	14,454	9,401
Receivables from collaboration arrangements	69,621	54,672
Inventory	40,737	55,897
Prepaid expenses	21,630	29,559
Other current assets	4,264	2,933
Total current assets	344,219	443,511
Property and equipment, net	483	170
Equity method investments	116,546	39,154
Equity and long-term investments	444,432	363,859
Capitalized fees paid, net	83,784	97,607
Right-of-use assets	2,536	3,265
Goodwill	17,905	26,713
Intangible assets	230,335	252,919
Other assets	3,267	4,299
Total assets	1,243,507	1,231,497
Current liabilities:
Accounts payable	6,717	2,939
Accrued personnel-related expenses	7,020	8,022
Accrued interest payable	3,422	4,359
Deferred revenue	1,277	2,094
Convertible subordinated notes due 2023, net of issuance costs	0	96,193
Income tax payable	0	154
Other accrued liabilities	19,698	21,207
Total current liabilities	38,134	134,968
Long-term debt, net of discount and issuance costs	446,234	444,180
Other long-term liabilities	71,870	70,918
Deferred tax liabilities, net	563	5,771
Income tax payable, long-term	11,751	9,872
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock: $0.01 par value, 230 shares authorized, no shares issued and outstanding	0	0
Common stock: $0.01 par value, 200,000 shares authorized, 69,307 and 69,188 issued and outstanding as of December 31, 2023 and December 31, 2022 respectively	633	692
Treasury stock: at cost, 32,005 shares as of December 31, 2023 and 2022	(393,829)	(393,829)
Additional paid-in capital	1,093,340	1,163,836
Accumulated deficit	(25,189)	(204,911)
Total stockholders' equity	674,955	565,788
Total liabilities and stockholders' equity	$ 1,243,507	$ 1,231,497