Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

4. Accumulated Other Comprehensive Income (Loss)

The following table summarizes the changes in accumulated other comprehensive income (loss), or AOCI, net of tax, from unrealized gains (losses) on available-for-sale marketable securities, the Company's only component of AOCI, for the years ended December 31, 2018, 2017 and 2016.

	TotalAccumulated Other Comprehensive Income (Loss)
Balance, December 31, 2015	$	(35	)
Other comprehensive income before reclassifications		61
Amount reclassified from accumulated other comprehensive income		(23	)
Net current period other comprehensive income		38
Balance, December 31, 2016		3
Other comprehensive loss before reclassifications		(68	)
Amount reclassified from accumulated other comprehensive income		(5	)
Net current period other comprehensive loss		(73	)
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	)

The reclassifications out of AOCI and into net loss were as follows:

	Year Ended December 31,							AffectedLine Item in the Statements of
Component of AOCI	2018			2017		2016		Comprehensive Loss
Unrealized gains (losses) on available-for-    sale marketable securities
Realized (losses) gains on sale of securities	$	(5	)	$	5	$	23	Other income
		—			—		—	Income tax benefit
	$	(5	)	$	5	$	23

The amounts reclassified out of AOCI into net loss were determined by specific identification.