Accumulated other comprehensive income (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Summary of Changes in Components of Accumulated Other Comprehensive Income

Following is a summary of the changes in each component of accumulated other comprehensive income:

	Year ended December 31,
	2021		2020		2019
Beginning balance at January 1	$	686	$	510	$	—
Unrealized gain (loss) on available-for-sale debt securities, before tax	(240)		236		683
Income tax effect	61		(60)		(173)
Other comprehensive income, net of tax, before reclassification adjustment	$	507	$	686	$	510
Reclassification adjustment for realized gain on sale of available-for-sale debt securities, before tax	(678)		—		—
Income tax effect	171		—		—
Total accumulated other comprehensive income, net of tax	$	—	$	686	$	510