Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (1,094)	$ 595	$ (7,822)
Unrealized investment gains (losses):
Unrealized investment gains (losses) during the period	(2,937)	1,589	3,725
Income tax expense (benefit)	0	0	824
Unrealized investment gains (losses), net of tax	(2,937)	1,589	2,901
Less: reclassification adjustments to:
Net realized investment gains (losses) included in net income (loss)	85	1,166	(200)
Income tax expense (benefit)	0	0	0
Total reclassifications included in net income (loss), net of tax	85	1,166	(200)
Other comprehensive income (loss)	(3,022)	423	3,101
Total comprehensive income (loss)	$ (4,116)	$ 1,018	$ (4,721)