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Certain Balance Sheet Items | 3 Months Ended
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Mar. 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):
|  | March 31, 2023 |  | December 31, 2022
Accounts receivable from product sales to partners |  | $ | 58,502 |  |  | $ | 62,979 |
Accounts receivable from revenues under collaborative agreements |  | 2,356 |  |  | 18,776 |
Accounts receivable from royalty payments |  | 100,829 |  |  | 100,900 |
Accounts receivable from other product sales |  | 6,774 |  |  | 6,229 |
Contract assets |  | 32,338 |  |  | 44,102 |
Total accounts receivable and contract assets |  | $ | 200,799 |  |  | $ | 232,986 |
Allowance for distribution fees and discounts |  | (5,916) |  |  | (1,914) |
Total accounts receivable, net and contract assets |  | $ | 194,883 |  |  | $ | 231,072 |
Inventories, net consisted of the following (in thousands):
|  | March 31, 2023 |  | December 31, 2022
Raw materials |  | $ | 22,453 |  |  | $ | 13,792 |
Work-in-process |  | 27,402 |  |  | 40,361 |
Finished goods |  | 57,666 |  |  | 45,970 |
Total inventories, net |  | $ | 107,521 |  |  | $ | 100,123 |
Prepaid expenses and other assets consisted of the following (in thousands):
|  | March 31, 2023 |  | December 31, 2022
Prepaid manufacturing expenses |  | $ | 50,084 |  |  | $ | 51,694 |
Other prepaid expenses |  | 4,739 |  |  | 4,647 |
Other assets |  | 7,424 |  |  | 14,984 |
Total prepaid expenses and other assets |  | $ | 62,247 |  |  | $ | 71,325 |
Less: Long-term portion |  | (25,240) |  |  | (26,301) |
Total prepaid expenses and other assets, current |  | $ | 37,007 |  |  | $ | 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):
|  | March 31, 2023 |  | December 31, 2022
Research equipment |  | $ | 8,836 |  |  | $ | 7,380 |
Manufacturing equipment |  | 31,007 |  |  | 27,893 |
Computer and office equipment |  | 8,173 |  |  | 7,855 |
Leasehold improvements |  | 6,699 |  |  | 6,729 |
Subtotal |  | $ | 54,715 |  |  | $ | 49,857 |
Accumulated depreciation and amortization |  | (16,171) |  |  | (14,756) |
Subtotal |  | $ | 38,544 |  |  | $ | 35,101 |
Right of use of assets |  | 39,420 |  |  | 40,469 |
Property and equipment, net |  | $ | 77,964 |  |  | $ | 75,570 |
Depreciation and amortization expense was approximately $2.6 million and $0.8 million, inclusive of ROU asset amortization of $1.4 million and $0.4 million for the three months ended March 31, 2023 and 2022, respectively. Accrued expenses consisted of the following (in thousands):
|  | March 31, 2023 |  | December 31, 2022
Accrued compensation and payroll taxes |  | $ | 10,837 |  |  | $ | 19,939 |
Accrued outsourced manufacturing expenses |  | 12,456 |  |  | 12,190 |
Income taxes payable |  | 2,638 |  |  | — |
Product returns and sales allowance |  | 29,610 |  |  | 30,261 |
Other accrued expenses |  | 19,947 |  |  | 29,771 |
Lease liability |  | 34,063 |  |  | 34,788 |
Total accrued expenses |  | $ | 109,551 |  |  | $ | 126,949 |
Less long-term portion |  | (29,573) |  |  | (30,433) |
Total accrued expenses, current |  | $ | 79,978 |  |  | $ | 96,516 |
Expense associated with the accretion of the lease liabilities was approximately $0.7 million and $0.1 million for the three months ended March 31, 2023 and 2022, respectively. Total lease expense for the three months ended March 31, 2023 and 2022 was $2.1 million and $0.5 million, respectively. Cash paid for amounts related to leases for the three months ended March 31, 2023 and 2022 was $1.7 million and $0.7 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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