Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Summary of Significant Accounting Policies [Abstract]
Components of Accumulated Other Comprehensive Loss	Foreign Currency Translation Unrealized (loss)/gain on securities Accumulated Other Comprehensive LossDecember 31, 2019 $ (709,000) $ 11,000 $ (698,000)Net current period change 9,000 10,000 19,000December 31, 2020 $ (700,000) $ 21,000 $ (679,000)Net current period change 700,000 (19,000) 681,000December 31, 2021 $ — $ 2,000 $ 2,000