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Fair Value of Financial Instruments - Fair Value Hierarchy for Financial Assets (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
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		$ 8,358,000
Fair Value, Measurements, Recurring | Money market funds
Fair value hierarchy for its financial assets
Available-for-sale Securities	620,000	84,000
Fair Value, Measurements, Recurring | U.S. government-sponsored enterprise bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities		3,767,000
Fair Value, Measurements, Recurring | Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale Securities		480,000
Fair Value, Measurements, Recurring | Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities		4,027,000
Fair Value, Measurements, Recurring | Level 1
Fair value hierarchy for its financial assets
Total assets		84,000
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Fair value hierarchy for its financial assets
Available-for-sale Securities	$ 620,000	84,000
Fair Value, Measurements, Recurring | Level 2
Fair value hierarchy for its financial assets
Total assets		8,274,000
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored enterprise bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities		3,767,000
Fair Value, Measurements, Recurring | Level 2 | Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale Securities		480,000
Fair Value, Measurements, Recurring | Level 2 | Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities		$ 4,027,000

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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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-SubTopic 10
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