Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Prepaid Expenses and Other Current Assets.
Vendor prepayments and deposits	$ 2,016	$ 2,681
Prepaid insurance	1,557	1,531
Prepaid facility maintenance fee	330	807
Other receivables	2,985
Interest receivables and other current assets	162	318
Total prepaid expenses and other current assets	$ 7,050	$ 5,337