Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Fair value information related to assets
Assets		$ 3,177	$ 2,638
Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets		3,177	2,638
Money market funds
Fair value information related to assets
Assets	[1]	122	121
Money market funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	[1]	122	121
Other mutual funds
Fair value information related to assets
Assets	[2]	3,055	2,517
Other mutual funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	[2]	$ 3,055	$ 2,517

[1] Money market funds are included in “Cash and cash equivalents” in the Condensed Consolidated Balance Sheets. These investments are classified as available-for-sale and are recorded at fair value. There have been no realized gains or losses related to these investments and we have not experienced any redemption restrictions with respect to any of the money market mutual funds.

[2] Other mutual funds are included in “Other investments and assets” in the Condensed Consolidated Balance Sheets.