Summary of Significant Accounting Policies - Summary of Total Revenue by Geographic Region Based on Customers' Locations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,171	$ 2,081	$ 3,998	$ 4,135
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,182	1,143	2,155	2,421
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	644	613	1,187	1,044
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	140	112	287	282
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 205	$ 213	$ 369	$ 388