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Prepaid and Other Current Assets | 12 Months Ended
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Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract] |
Prepaid and Other Current Assets | 5. Prepaid and Other Current Assets Prepaid as sets and other current assets consisted of the following as of December 31, 2023, and December 31, 2022 (in thousands):
|  | December 31, |
|  | 2023 |  |  | 2022 |
Down payments for inventory |  | $ | 16,296 |  |  | $ | 13,987 |
Prepaid research and development |  |  | 13,931 |  |  |  | 15,181 |
Other prepaid expenses |  |  | 8,593 |  |  |  | 7,182 |
Total prepaid expenses |  | $ | 38,820 |  |  | $ | 36,350 |
|  | December 31, |
|  | 2023 |  |  | 2022 |
Royalties receivable |  |  | 3,054 |  |  | $ | 1,442 |
ERC credit |  |  | — |  |  |  | 8,711 |
Receivable from collaboration agreement (1) |  |  | 15,000 |  |  |  | 20,000 |
Deposits and other current assets |  |  | 4,354 |  |  |  | 6,505 |
Total other current assets |  | $ | 22,408 |  |  | $ | 36,658 |
(1) In January 2024 the Company waived the remaining reimbursement payment of $15.0 million in connection with the decision to discontinue the CAD program. Under the provisions of the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) signed into law on March 27, 2020 and the subsequent extension of the CARES Act, the Company was eligible for a refundable employee retention credit (“ERC”) subject to certain criteria. The ERC provides eligible employers with less than 500 employees a refundable tax credit against the employer’s share of social security taxes. The ERC is equal to 70% of qualified wages paid to employees during 2021 calendar year for a maximum credit of $7,000 per employee for each calendar quarter through September 30, 2021. In November 2022, the Company filed for an $8.7 million refund under the CARES Act relating to the ERC. The full refund amount was received in 2023.

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