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Certain Balance Sheet Items | 12 Months Ended
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Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract] |
Certain Balance Sheet Items | Certain Balance Sheet Items Accounts receivable, net and contract assets consisted of the following (in thousands):
|  | December 31, 2023 |  | December 31, 2022
Accounts receivable from product sales to partners |  | $ | 58,588 |  |  | $ | 62,979 |
Accounts receivable from revenues under collaborative agreements |  | 16,183 |  |  | 18,776 |
Accounts receivable from royalty payments |  | 118,170 |  |  | 100,900 |
Accounts receivable from other product sales |  | 47,060 |  |  | 6,229 |
Contract assets |  | 956 |  |  | 44,102 |
Total accounts receivable and contract assets |  | 240,957 |  |  | 232,986 |
Allowance for distribution fees and discounts |  | (6,747) |  |  | (1,914) |
Total accounts receivable, net and contract assets |  | $ | 234,210 |  |  | $ | 231,072 |
Inventories consisted of the following (in thousands):
|  | December 31, 2023 |  | December 31, 2022
Raw materials |  | $ | 23,646 |  |  | $ | 13,792 |
Work-in-process |  | 34,025 |  |  | 40,361 |
Finished goods |  | 69,930 |  |  | 45,970 |
Total inventories, net |  | $ | 127,601 |  |  | $ | 100,123 |
Prepaid expenses and other assets consisted of the following (in thousands):
|  | December 31, 2023 |  | December 31, 2022
Prepaid manufacturing expenses |  | $ | 36,850 |  |  | $ | 51,694 |
Other prepaid expenses |  | 12,902 |  |  | 4,647 |
Other assets |  | 16,677 |  |  | 14,984 |
Total prepaid expenses and other assets |  | 66,429 |  |  | 71,325 |
Less: Long-term portion |  | (17,816) |  |  | (26,301) |
Total prepaid expenses and other assets, current |  | $ | 48,613 |  |  | $ | 45,024 |
Prepaid manufacturing expenses include raw materials, slot reservation fees and other amounts paid to contract manufacturing organizations. Such amounts are reclassified to work-in-process inventory as materials are used or the contract manufacturing organization services are complete. Property and equipment, net consisted of the following (in thousands):
|  | December 31, 2023 |  | December 31, 2022
Research equipment |  | $ | 8,588 |  |  | $ | 7,380 |
Manufacturing equipment |  | 32,472 |  |  | 27,893 |
Computer and office equipment |  | 9,722 |  |  | 7,855 |
Leasehold improvements |  | 6,987 |  |  | 6,729 |
Subtotal |  | 57,769 |  |  | 49,857 |
Accumulated depreciation and amortization |  | (19,661) |  |  | (14,756) |
Subtotal |  | 38,108 |  |  | 35,101 |
Right of use of assets |  | 36,836 |  |  | 40,469 |
Property and equipment, net |  | $ | 74,944 |  |  | $ | 75,570 |
Depreciation and amortization expense was approximately $11.1 million, $6.5 million, and $3.0 million, inclusive of ROU asset amortization of $5.5 million, $3.0 million and $1.6 million for the years ended December 31, 2023, 2022 and 2021, respectively. Accrued expenses consisted of the following (in thousands):
|  | December 31, 2023 |  | December 31, 2022
Accrued compensation and payroll taxes |  | $ | 17,361 |  |  | $ | 19,939 |
Accrued outsourced manufacturing expenses |  | 12,361 |  |  | 12,190 |
Income taxes payable |  | 963 |  |  | — |
Product returns and sales allowance |  | 41,932 |  |  | 30,261 |
Other accrued expenses |  | 33,584 |  |  | 35,270 |
Lease liability |  | 32,197 |  |  | 34,788 |
Total accrued expenses |  | 138,398 |  |  | 132,448 |
Less long-term portion |  | (37,720) |  |  | (32,686) |
Total accrued expenses, current |  | $ | 100,678 |  |  | $ | 99,762 |
Expense associated with the accretion of the lease liabilities was approximately $2.5 million, $0.5 million and $0.3 million for the twelve months ended December 31, 2023, 2022 and 2021, respectively. Total lease expense for the twelve months ended December 31, 2023, 2022 and 2021 was $8.0 million, $3.3 million and $1.9 million, respectively. Cash paid for amounts related to leases for the twelve months ended December 31, 2023, 2022 and 2021 was $6.7 million, $4.2 million and $2.7 million, respectively.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//210/tableOfContent + Details
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