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Marketable Securities Maturity Schedule (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]          
Marketable Securities, Realized Gain (Loss) $ 27 $ 27 $ 88 $ 93  
Available-for-sale Debt Securities, Amortized Cost Basis 26,596   26,596   $ 24,509
Available-for-sale Securities 26,599   26,599   24,513
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 3   3   7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0   0   3
Mutual Funds, Money Market [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Debt Securities, Amortized Cost Basis 15,722   15,722   6,824
Available-for-sale Securities 15,722   15,722   6,824
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0   0   0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0   0   0
Debt Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis 4,311   4,311   7,663
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 4,314   4,314   7,668
Available-for-sale Securities, Debt Maturities, Year Two, Amortized Cost Basis 6,563   6,563   10,022
Available-for-sale Securities, Debt Maturities, Year Two, Fair Value 6,563   6,563   10,021
Available-for-sale Debt Securities, Amortized Cost Basis 10,874   10,874   17,685
Available-for-sale Securities 10,877   10,877   17,689
Government Agency Debt Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Debt Securities, Amortized Cost Basis 1,503   1,503   3,505
Available-for-sale Securities 1,503   1,503   3,502
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0   0   0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0   0   3
US Treasury Securities          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Debt Securities, Amortized Cost Basis 1,001   1,001   4,002
Available-for-sale Securities 1,003   1,003   4,006
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 2   2   4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0   0   0
Corporate Debt Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Debt Securities, Amortized Cost Basis 2,528   2,528   4,665
Available-for-sale Securities 2,529   2,529   4,667
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1   1   2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0   0   0
Certificates of Deposit          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Debt Securities, Amortized Cost Basis 5,842   5,842   4,155
Available-for-sale Securities 5,842   5,842   4,155
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0   0   0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 0   $ 0   0
Municipal Bonds [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Debt Securities, Amortized Cost Basis         1,358
Available-for-sale Securities         1,359
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax         1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax         0
Municipal Bonds [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Assets, Fair Value Disclosure         1,359
Fair Value, Inputs, Level 1 | Municipal Bonds [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Assets, Fair Value Disclosure         0
Fair Value, Inputs, Level 2 | Municipal Bonds [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Assets, Fair Value Disclosure         1,359
Fair Value, Inputs, Level 3 | Municipal Bonds [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Assets, Fair Value Disclosure         $ 0