Segment Reporting and Geographical Concentration (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments | segment	1
Number of operating segments | segment	1
Revenue from contract with customer	$ 15,889	$ 14,291
Total property and equipment	656		$ 591
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer	4,755	2,310
Total property and equipment	179		74
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer	4,062	4,865
Total property and equipment	221		242
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer	1,731	2,680
Total property and equipment	143		152
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer	1,092	1,178
All other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer	4,249	$ 3,258
Total property and equipment	$ 113		$ 123