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Financial Instruments and Marketable Securities - Future Maturities of Available-For-Sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale securities, Amortized Cost, Maturities Less than 12 Months $ 197
Available-for-sale securities, Fair Value, Maturities Less than 12 Months 453
Available-for-sale securities, Amortized Cost, Maturities Greater than 12 Months 0
Available-for-sale securities, Fair Value, Maturities Greater than 12 Months 0
Common stock [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale securities, Amortized Cost, Maturities Less than 12 Months 197
Available-for-sale securities, Fair Value, Maturities Less than 12 Months 453
Available-for-sale securities, Amortized Cost, Maturities Greater than 12 Months 0
Available-for-sale securities, Fair Value, Maturities Greater than 12 Months $ 0