Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Summary of Financial Assets Carried at Fair Value and Measured on Recurring Basis

Financial assets carried at fair value and measured on a recurring basis as of December 31, 2020 are classified in the hierarchy as follows (in thousands):

	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	286	$	286	$	—	$	—
Total cash equivalents		286		286		—		—
Available-for-sale investments
U.S. corporate debt securities		858		—		858		—
Foreign corporate debt securities		953		—		953		—
Total available-for-sale investments		1,811		—		1,811		—
Total financial assets carried at fair value	$	2,097	$	286	$	1,811	$	—