Investments (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments in Fixed Income Securities

Our investments in fixed income securities as of December 31, 2015 were as follows:

	As of December 31,
	2015
	Amortized						Fair
(In thousands)	cost		Gains		Losses		Value
Corporate debt securities	$	28,549	$	1	$	(30)	$	28,520
Commercial paper		24,187		1		(1)		24,187
Securities and obligations of U.S. government agencies		12,431		—		(5)		12,426
Total	$	65,167	$	2	$	(36)	$	65,133

	As of December 31,
	2014
	Amortized						Fair
(In thousands)	cost		Gains		Losses		Value
Corporate debt securities	$	19,756	$	3	$	(21)	$	19,738
Commercial paper		16,391		2		—		16,393
Securities and obligations of U.S. government agencies		13,641		2		(7)		13,636
Total	$	49,788	$	7	$	(28)	$	49,767

Summary of the Balance Sheet Classification of Investments

	As of December 31,
(In thousands)	2015		2014
Cash equivalents	$	13,499	$	13,699
Short-term investments		49,574		13,869
Long-term investments		2,094		22,220
Total investments	$	65,167	$	49,788

Schedule of Held-to-Maturity Investments by Contractual Maturity

	As of December 31,
	2015				2014
	Gross				Gross
	Amortized		Fair		Amortized		Fair
(In thousands)	Cost		Value		Cost		Value
Due in one year or less	$	63,073	$	63,040	$	27,568	$	27,565
Due after one year through five years		2,094		2,093		22,220		22,202
Total	$	65,167	$	65,133	$	49,788	$	49,767