Summary of Significant Accounting Policies - Voluntary Recall (Narrative) (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Inventory [Line Items]
Inventories	$ 17,616,000	$ 17,851,000
Contingent liabilities requiring accrual	0	0
ENROUTE [Member]
Inventory [Line Items]
Contingent liabilities requiring accrual	11,000	11,000
Voluntary Recall
Inventory [Line Items]
Inventories	$ 0	$ 335,000