Fair Value and Credit Risk of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurement of Financial Assets

The following table sets forth information regarding the recurring fair value measurement of our financial assets as reflected on our Condensed Consolidated Balance Sheet as of March 31, 2015:

			Fair Value Measurements at Reporting Date Using
			(Level 1)		(Level 2)		(Level 3)
Description	As of March 31, 2015		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Cash equivalents:
Money market fund	$	141,930	$	141,930	$	0	$	0
Restricted cash:
Money market fund		1,811		1,811		0		0
Collateral deposits:
Money market fund		8,629		8,629		0		0
	$	152,370	$	152,370	$	0	$	0

The following table sets forth information regarding the recurring fair value measurement of our financial assets as reflected on our Condensed Consolidated Balance Sheet as of March 31, 2014:

			Fair Value Measurements at Reporting Date Using
			(Level 1)		(Level 2)		(Level 3)
Description	As of March 31, 2014		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Cash equivalents:
Money market fund	$	204,967	$	204,967	$	0	$	0
Restricted cash:
Money market fund		2,042		2,042		0		0
Collateral deposits:
Money market fund		8,626		8,626		0		0
	$	215,635	$	215,635	$	0	$	0