Accumulated Other Comprehensive Income/(Loss) (Tables)

12 Months Ended

Dec. 31, 2018

Accumulated Other Comprehensive Income/(Loss).

Reconciliation of accumulated other comprehensive income/(loss)

			Accumulated
	Accumulated		other comprehensive
	other comprehensive		income/(loss),
	income/(loss)		net of tax
As of December 31, 2016	$	15	$	14
Other comprehensive gain due to change in fair market value of marketable securities during period		(17)		(14)
As of December 31, 2017	$	(2)	$	—
Cumulative adjustment related to Accounting Standard Update 2016-01		2
As of January 1, 2018	$	—	$	—
As of December 31, 2018	$	—	$	—