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Prepaid Expenses and Other Current Assets	3 Months Ended
Prepaid Expenses and Other Current Assets	Mar. 31, 2022
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid Expenses and Other Current Assets	4. Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consist of the following (in thousands): March 31, December 31, 2022 2021 Prepaid materials and supplies $ 3,657 $ 3,517 Deposits 3,468 4,379 Clinical prepayments 709 614 Other 349 341 $ 8,183 $ 8,851 The Company’s prepaid material and supplies related to enzyme-linked immunosorbent assay (“ELISA”) test production, of which $ 1.0 million was paid to a related party and $ 2.5 million related to materials to be utilized during its Phase 3 COVID-19 vaccine clinical trial.