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Fair Value of Financial Instruments - Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 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	17,844	$ 18,458
Fair Value, Measurements, Recurring | Money market funds
Fair value hierarchy for its financial assets
Available-for-sale Securities	2,721	2,238
Fair Value, Measurements, Recurring | U.S. government-sponsored enterprise bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities	4,552	7,525
Fair Value, Measurements, Recurring | Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale Securities	10,571	8,255
Fair Value, Measurements, Recurring | Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities		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	2,721	2,238
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Fair value hierarchy for its financial assets
Available-for-sale Securities	2,721	2,238
Fair Value, Measurements, Recurring | Level 2
Fair value hierarchy for its financial assets
Total assets	15,123	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	4,552	7,525
Fair Value, Measurements, Recurring | Level 2 | Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale Securities	$ 10,571	8,255
Fair Value, Measurements, Recurring | Level 2 | Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities		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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 25
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No definition available.

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