Accumulated Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 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 nine months ended September 30, 2018 and September 30, 2017.

	Total Accumulated Other Comprehensive Income (Loss)
Balance, December 31, 2017	$	(70	)
Other comprehensive income before reclassifications		51
Amount reclassified from accumulated    other comprehensive loss		32
Net current period other comprehensive income		83
Balance, September 30, 2018	$	13
Balance, December 31, 2016	$	3
Other comprehensive income before reclassifications		41
Amount reclassified from accumulated other    comprehensive income		(4	)
Net current period other comprehensive income		37
Balance, September 30, 2017	$	40

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

	Three Months Ended September 30,					Nine Months Ended September 30,					Affected Line Item in the Statements of
Component of AOCI	2018			2017		2018			2017		Operations
Unrealized gains (losses) on available-    for-sale marketable securities	$	(17	)	$	—	$	(32	)	$	4	Other income
		—			—		—			—	Benefit from income taxes
	$	(17	)	$	—	$	(32	)	$	4

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