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Composition of Other Balance Sheet Items
 12 Months Ended
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Composition of Other Balance Sheet Items Composition of Other Balance Sheet Items
The following details the composition of other balance sheet items (dollars in thousands for amounts in tables):
Accounts Receivable
As of December 31, 2023, and December 31, 2022, the Company has reduced accounts receivable by approximately $10.7 million and $13.0 million, respectively. Prompt pay discount and contractual service fees, which were originally recorded as reduction to revenues, represents estimated amounts not expected to be paid by our customers. The Company's customers are primarily pharmaceutical wholesalers and distributors and specialty pharmacies.
Inventories, net
Inventories consist of the following (dollars in thousands):
 December 31,
2023		December 31,
2022
Raw materials$16,274 $24,820 
Work in process31,212 31,710 
Finished goods29,922 35,011 
Total$77,408 $91,541 
The Company recorded inventory write-offs of $8.0 million and $10.4 million for the years ended December 31, 2023 and 2022, respectively.
Property and Equipment, net
Property and equipment consist of the following (dollars in thousands):
 December 31,
2023		December 31,
2022
Lab equipment and furniture$13,069 $12,127 
Leasehold improvements14,023 14,023 
Software883 883 
Computer equipment960 983 
Construction-in-progress— 206 
28,935 28,222 
Less accumulated depreciation and amortization(15,405)(13,049)
Total$13,530 $15,173 
Depreciation and amortization expense on property and equipment was approximately $2.5 million, $3.0 million, and $2.6 million for the years ended December 31, 2023, 2022 and 2021, respectively.
Accounts Payable and Accrued Liabilities
Accounts payable and accrued liabilities consist of the following (dollars in thousands):
 December 31,
2023		December 31,
2022
Accounts payable$1,964 $10,543 
Accrued compensation, benefits, & related accruals20,722 16,963 
Accrued manufacturing expenses11,652 15,216 
Accrued sales & marketing11,666 16,783 
Accrued R&D expenses10,530 7,490 
Operating lease liabilities, current portion (1)
8,331 6,791 
Accrued royalties (2)
7,918 12,022 
Other accrued expenses6,786 10,534 
Total$79,569 $96,342 
(1) Refer to Note 12, Leases.
(2) Refer to Note 15, Commitments and Contingencies.
Accrued Product Returns and Rebates
Accrued product returns and rebates consist of the following (dollars in thousands):
 December 31,
2023		December 31,
2022
Accrued product rebates$96,984 $106,657 
Accrued product returns57,290 45,008 
Total$154,274 $151,665