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Fair Value of Financial Instruments - Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Transfer of assets between Level 1 to Level 2 | $ 0 | $ 0
Transfer of assets between Level 2 to Level 1 | 0 | 0
Transfer of liabilities between Level 1 to Level 2 | 0 | 0
Transfer of liabilities between Level 2 to Level 1 | 0 | 0
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total assets | 18,458 | 25,168
Fair Value, Measurements, Recurring | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | 2,238 | 1,837
Fair Value, Measurements, Recurring | U.S. government-sponsored enterprise bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | 7,525 | 2,248
Fair Value, Measurements, Recurring | Municipal Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | 200 | 1,243
Fair Value, Measurements, Recurring | Corporate notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | 8,255 | 17,164
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | 240 | 2,676
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total assets | 2,238 | 1,837
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | 2,238 | 1,837
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total assets | 16,220 | 23,331
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored enterprise bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | 7,525 | 2,248
Fair Value, Measurements, Recurring | Level 2 | Municipal Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | 200 | 1,243
Fair Value, Measurements, Recurring | Level 2 | Corporate notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | 8,255 | 17,164
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale Securities | $ 240 | $ 2,676

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