Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (4,636)	$ (4,725)
Unrealized investment gains (losses):
Unrealized investment gains (losses) during the period	(1,924)	(1,315)
Income tax (benefit) expense	0	0
Unrealized investment gains (losses), net of tax	(1,924)	(1,315)
Less: reclassification adjustments to:
Net realized investment gains (losses) included in net income (loss)	943	384
Income tax (benefit) expense	0	0
Total reclassifications included in net income (loss), net of tax	943	384
Other comprehensive income (loss)	(2,867)	(1,699)
Total comprehensive income (loss)	$ (7,503)	$ (6,424)