Investment in Securities Held to Maturity (Tables)

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Summary of held to maturity securities

The following is a summary of held to maturity securities at September 30, 2017:

		September 30, 2017
	Contractual Maturity (in months)	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Market Value
Mutual funds		$	—	$	—	$	—	$	—
Corporate fixed income securities	Less than 12 months		2,746		3		—		2,749
Commercial paper	Less than 12 months		200		—		—		200
Total investments		$	2,946	$	3	$	—	$	2,949