Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax, from Unrealized Gains (Losses) on Available-for-Sale Marketable Securities

The following table summarizes the changes in accumulated other comprehensive income (loss), net of tax, from unrealized gains (losses) on available-for-sale marketable securities, the Company’s only component of accumulated other comprehensive income (loss), for the years ended December 31, 2020, 2019 and 2018.

	Total Accumulated
	Other Comprehensive
	Income (Loss)
Balance, December 31, 2017	$	(70)
Other comprehensive loss before reclassifications		(49)
Amount reclassified from accumulated other comprehensive loss		5
Net current period other comprehensive loss		(44)
Balance, December 31, 2018	$	(114)
Other comprehensive income before reclassifications		284
Amount reclassified from accumulated other comprehensive loss		—
Net current period other comprehensive income		284
Balance, December 31, 2019	$	170
Other comprehensive income before reclassifications		175
Amount reclassified from accumulated other comprehensive income		(272)
Net current period other comprehensive loss		(97)
Balance, December 31, 2020	$	73

Schedule of Reclassification Out of Accumulated Other Comprehensive Income (Loss)

Amounts reclassified out of accumulated other comprehensive income (loss) into net income (loss) are determined by specific identification. The reclassifications out of accumulated other comprehensive income (loss) and into net income (loss) were as follows:

							Affected Line Item in the
Component of Accumulated Other	Year Ended December 31,						Statements of
Comprehensive Income (Loss)	2020		2019		2018		Comprehensive Income (Loss)
Unrealized gains (losses) on available-for- sale marketable securities
Realized gains (losses) on sale of securities	$	272	$	—	$	(5)	Other income, net
		—		—		—	Benefit from income taxes
	$	272	$	—	$	(5)