The Company and its Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Amount of cash insured	$ 8,200	$ 3,900
Excess of the federal deposit insurance corporation	250
China
Cash and Cash Equivalents [Line Items]
Cash uninsured	1,900	1,200
Singapore
Cash and Cash Equivalents [Line Items]
Cash uninsured	296	149
Hong Kong
Cash and Cash Equivalents [Line Items]
Cash uninsured	$ 202	$ 386