Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Fair value of asset measured on a recurring basis

The fair value of the Company’s financial assets measured at fair value on a recurring basis was determined using the following inputs at December 31, 2013 (in thousands):



	Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Money market funds ⁽¹⁾	$	5,254	$	5,254	$	—	$	—
U.S. government securities⁽²⁾	42,987		—		42,987		—
Total	$	48,241	$	5,254	$	42,987	$	—

⁽¹⁾ Included in cash and cash equivalents in the Company’s consolidated balance sheets


⁽²⁾	Represents the portfolio of available for sale securities and is included in restricted investments and short-term investments in the Company’s consolidated balance sheets

The fair value of the Company’s financial assets and liabilities measured at fair value on a recurring basis was determined using the following inputs at December 31, 2014 (in thousands):



	Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds ⁽¹⁾	$	9,023	$	9,023	$	—	$	—
U.S. government securities⁽²⁾	30,230		—		30,230		—
Total	$	39,253	$	9,023	$	30,230	$	—

Liabilities:
Contingent consideration	$	968	$	—	$	—	$	968
Total	$	968	$	—	$	—	$	968

Level 3 Rollforward [Table Text Block]

The table below includes a rollforward of the balance sheet amounts for financial instruments classified by the Company within Level 3 of the valuation hierarchy for the year ended December 31, 2014 (in thousands):



	Contingent Consideration
BALANCE AT DECEMBER 31, 2013	$	—
Recorded in conjunction with acquisition of Lumewave, Inc.	925
Amortization of interest on contingent consideration	43
BALANCE AT DECEMBER 31, 2014	$	968

Fair value of short term investment unrealized holdings and gains

As of December 31, 2014, the Company’s available-for-sale securities had contractual maturities from eight to twelve months and an average remaining term to maturity of seven months. As of December 31, 2014, the amortized cost basis, aggregate fair value, and gross unrealized holding gains and losses of the Company’s short-term investments by major security type were as follows (in thousands):



	Amortized Cost		Aggregate Fair Value		Unrealized Holding Gains		Unrealized Holding Losses
U.S. government and agency securities	$	30,237	$	30,230	$	—	$	7

The amortized cost basis, aggregate fair value and gross unrealized holding gains and losses for the Company’s available-for-sale short-term investments, by major security type, were as follows as of December 31, 2013 (in thousands):



	Amortized Cost		Aggregate Fair Value		Unrealized Holding Gains		Unrealized Holding Losses
U.S. government securities	$	42,979	$	42,987	$	8	$	—