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Fair Value Measurements (Fair Values Of The Company's Assets And Liabilities) (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities $ 18,500,000 $ 13,200,000
Long-term marketable securities 28,500,000 40,500,000
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [1] 3,800,000 6,400,000
Short-term marketable securities [2] 18,500,000 13,200,000
Long-term marketable securities [2] 28,500,000 40,500,000
Total assets 50,800,000 60,100,000
Individual securities gross unrealized losses 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [1] 400,000 6,400,000
Short-term marketable securities [2] 3,900,000 9,500,000
Long-term marketable securities [2] 20,300,000 30,600,000
Total assets 24,600,000 46,500,000
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [1] 3,400,000  
Short-term marketable securities [2] 14,600,000 3,700,000
Long-term marketable securities [2] 8,200,000 9,900,000
Total assets $ 26,200,000 $ 13,600,000
[1] Cash Equivalents—The Company’s cash equivalents are carried at estimated fair value. Cash equivalents consist of money market accounts which the Company has classified as Level 1 given the active market for these accounts and commercial paper with original maturities of three months or less, which are classified as Level 2 and are valued as described below.
[2] Short-Term and Long-Term Marketable Securities—The carrying amount and fair value of the marketable securities are equivalent since the Company accounts for these instruments at fair value. The Company’s government agency bonds, commercial paper and certificates of deposit are valued using third party broker quotes. The value of the Company’s government agency bonds is derived from quoted market information. The inputs in the valuation are generally classified as Level 1 given the active market for these securities; however, if an active market does not exist, the inputs are recorded at a lower level in the fair value hierarchy. The value of commercial paper and certificates of deposit is derived from pricing models using inputs based upon market information, including contractual terms, market prices and yield curves. The inputs to the valuation pricing models are observable in the market, and as such are generally classified as Level 2 in the fair value hierarchy. For the three and six months ended June 30, 2016 and July 2, 2015, there was an inconsequential amount of net realized gains (losses) recognized in interest income and an inconsequential amount of net unrealized holding gains (losses) included in other comprehensive income. Original cost of short-term marketable securities is based on the specific identification method. As of June 30, 2016, there was an inconsequential amount of gross unrealized losses related to individual securities that had been in a continuous loss position for 12 months or longer, and as of December 31, 2015, there were no gross unrealized losses related to individual securities that had been in a continuous loss position for 12 months or longer.