Investments and Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Marketable Securities [Abstract]

Held-to-maturity Securities

The following tables summarize these investments:

			December 31, 2015
Security Type	Remaining Maturity	Consolidated Balance Sheet Classification	Amortized Cost
			(In thousands)
Corporate Securities	15 to 202 Days	Investments (current)	$	12,425

			December 31, 2014
Security Type	Remaining Maturity	Consolidated Balance Sheet Classification	Amortized Cost
			(In thousands)
Corporate Securities	9 to 349 Days	Investments (current)	$	11,825
Corporate Securities	380 to 567 Days	Investments (non-current)	12,630
Total			$	24,455

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis

The following tables present the Company's financial instruments that are measured at fair value on a recurring basis:

	December 31, 2015
	Total		Level 1		Level 2		Level 3
	(In thousands)
Asset:
Money market funds as cash equivalents	$	17,143	$	17,143	$	—	$	—

	December 31, 2014
	Total		Level 1		Level 2		Level 3
	(In thousands)
Asset:
Money market funds as cash equivalents	$	13,851	$	13,851	$	—	$	—