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Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair value of asset measured on a recurring basis    
Fixed income available-for-sale securities $ 11,975 $ 11,983
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair value of asset measured on a recurring basis    
Money market funds [1] 4,536 4,513
Fixed income available-for-sale securities [2] 0 0
Total 4,536 4,513
Significant Other Observable Inputs (Level 2)    
Fair value of asset measured on a recurring basis    
Money market funds [1] 0 0
Fixed income available-for-sale securities [2] 13,227 13,233
Total 13,227 13,233
Significant Unobservable Inputs (Level 3)    
Fair value of asset measured on a recurring basis    
Money market funds [1] 0 0
Fixed income available-for-sale securities [2] 0 0
Total 0 0
Recurring    
Fair value of asset measured on a recurring basis    
Money market funds [1] 4,536 4,513
Fixed income available-for-sale securities [2] 13,227 13,233
Total $ 17,763 $ 17,746
[1] Included in cash and cash equivalents in the Company’s condensed consolidated balance sheets
[2] Represents the portfolio of available for sale securities that is included in restricted investments and short-term investments in the Company’s condensed consolidated balance sheets