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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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