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Fair Value Measurement
12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurement
Fair Value Measurement
 
Fair value represents the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. When determining fair value, the Company considers the principal or most advantageous market in which the Company would conduct a transaction, in addition to the assumptions that market participants would use when pricing the related assets or liabilities, including non-performance risk.

A three-level hierarchy prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The three levels of the fair value hierarchy are as follows:
 
Level 1—Quoted prices in active markets for identical assets or liabilities.
 
Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
 
Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Assets and Liabilities Measured on a Recurring Basis
 
The Company’s restricted cash equivalents that serve as collateral for the Company’s outstanding letters of credit typically consist of money market funds or U.S. Treasury securities that are measured at fair value based on quoted prices, which are level 1 inputs.
The Company’s interest rate swap is measured at fair value using a discounted cash flow analysis that includes the contractual terms, including the period to maturity, and level 2 observable market-based inputs, including interest rate curves. The fair value of the swap is determined by netting the discounted future fixed cash receipts payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of future interest rates (forward curves) derived from observable market interest rate yield curves. The valuation also considers credit risk adjustments that are necessary to reflect the probability of default by the counterparty or the Company, which are considered Level 3 inputs; however, as of December 31, 2015, the credit risk adjustments, including nonperformance risk, were considered insignificant to the total fair value of the interest rate swap.
    
The Company’s contingent consideration liabilities are measured at fair value using probability-weighted discounted cash flow analysis for the acquired companies, which are level 3 inputs.
 
The following tables present information about assets and liabilities measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value:
 
Fair Value Measurements as of December 31, 2015
Assets (Liabilities)
Total
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
Money market funds
$
5,627

 
$
5,627

 
$

 
$

Interest rate swap asset
165

 

 
165

 

Acquisition contingent consideration liabilities
(3,770
)
 

 

 
(3,770
)
 
 
Fair Value Measurements as of December 31, 2014
Assets (Liabilities)
Total
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
Money market funds
$
335

 
$
335

 
$

 
$

U.S. Treasury securities
5,291

 
5,291

 

 

Acquisition contingent consideration liabilities
(1,400
)
 

 

 
(1,400
)

The following table sets forth reconciliations of changes in the fair value of contingent consideration liabilities classified as Level 3 in the fair value hierarchy:
 
Years Ended December 31,
 
2015
 
2014
Balance as of January 1
$
(1,400
)
 
$

Contingent consideration liabilities recorded at purchase
(2,700
)
 
(1,400
)
Change in fair value of contingent consideration earn-out liabilities
330

 

Balance as of December 31
$
(3,770
)
 
$
(1,400
)


Assets Measured on a Non-Recurring Basis
 
The Company applies fair value techniques on a non-recurring basis associated with valuing potential impairment losses related to its goodwill, indefinite-lived intangible assets, long-lived assets and equity method investment. The fair values of these assets are estimated primarily using Level 3 inputs such as discounted cash flows, which are not observable from the market, directly or indirectly. There were no impairment charges recorded during the three years ended December 31, 2015 requiring such measurements.