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Fair Value of Financial Instruments - Fair Value Hierarchy for Financial Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair value hierarchy for its financial assets
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 hierarchy for its financial assets
Total assets	8,358	18,458
Fair Value, Measurements, Recurring | Money market funds
Fair value hierarchy for its financial assets
Available-for-sale Securities	84	2,238
Fair Value, Measurements, Recurring | U.S. government-sponsored enterprise bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities	3,767	7,525
Fair Value, Measurements, Recurring | Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale Securities	480	8,255
Fair Value, Measurements, Recurring | Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities	4,027	200
Fair Value, Measurements, Recurring | Certificates of deposit
Fair value hierarchy for its financial assets
Available-for-sale Securities		240
Fair Value, Measurements, Recurring | Level 1
Fair value hierarchy for its financial assets
Total assets	84	2,238
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Fair value hierarchy for its financial assets
Available-for-sale Securities	84	2,238
Fair Value, Measurements, Recurring | Level 2
Fair value hierarchy for its financial assets
Total assets	8,274	16,220
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored enterprise bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities	3,767	7,525
Fair Value, Measurements, Recurring | Level 2 | Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale Securities	480	8,255
Fair Value, Measurements, Recurring | Level 2 | Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities	$ 4,027	200
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit
Fair value hierarchy for its financial assets
Available-for-sale Securities		$ 240

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
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