Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2016

Investments Debt And Equity Securities [Abstract]

Summary of Major Security Type Assets Measured at Fair Value on Recurring Basis

The following tables summarize, by major security type, our assets that are measured at fair value on a recurring basis (in thousands):

	September 30, 2016
	Amortized		Gross Unrealized		Gross Unrealized			Estimated Fair
	Cost		Gains		Losses			Value
Corporate debt securities	$	24,343	$	—	$	(9	)	$	24,334

	December 31, 2015
	Amortized		Gross Unrealized		Gross Unrealized		Estimated Fair
	Cost		Gains		Losses		Value
Corporate debt securities	$	325	$	—	$	—	$	325

Schedule of Estimated Fair Value of Investments by Contractual Maturity

The estimated fair value of investments by contractual maturity is as follows (in thousands):

	September 30,		December 31,
	2016		2015
Due within one year	$	24,334	$	325
Due after one year and through 5 years		—		—
Due after 5 years and through 10 years		—		—
Due after 10 years		—		—
Total	$	24,334	$	325