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Fair Value of Financial Instruments (Details 3) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Fair value hierarchy for its financial assets
Cash equivalents	$ 1,585	$ 3,110
Transfer of assets between Level 1 to Level 2	0		$ 0
Transfer of liabilities between Level 1 to Level 2	0		0
Transfer of assets between Level 2 to Level 1	0		0
Transfer of liabilities between Level 2 to Level 1	0		0
Fair Value, Measurements, Recurring [Member]
Fair value hierarchy for its financial assets
Total assets	24,884		25,168
Fair Value, Measurements, Recurring [Member] | Money market funds
Fair value hierarchy for its financial assets
Cash equivalents	203		1,837
Fair Value, Measurements, Recurring [Member] | U.S. government-sponsored enterprise bonds
Fair value hierarchy for its financial assets
Available-for-sale securities	8,440		2,248
Fair Value, Measurements, Recurring [Member] | Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale securities	996		1,243
Fair Value, Measurements, Recurring [Member] | Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale securities	14,190		17,164
Fair Value, Measurements, Recurring [Member] | Certificates of deposit
Fair value hierarchy for its financial assets
Available-for-sale securities	405		2,676
Fair Value, Measurements, Recurring [Member] | Commercial Paper
Fair value hierarchy for its financial assets
Available-for-sale securities	650
Fair Value, Measurements, Recurring [Member] | Level 1
Fair value hierarchy for its financial assets
Total assets	203		1,837
Fair Value, Measurements, Recurring [Member] | Level 1 | Money market funds
Fair value hierarchy for its financial assets
Cash equivalents	203		1,837
Fair Value, Measurements, Recurring [Member] | Level 2
Fair value hierarchy for its financial assets
Total assets	24,681		23,331
Fair Value, Measurements, Recurring [Member] | Level 2 | U.S. government-sponsored enterprise bonds
Fair value hierarchy for its financial assets
Available-for-sale securities	8,440		2,248
Fair Value, Measurements, Recurring [Member] | Level 2 | Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale securities	996		1,243
Fair Value, Measurements, Recurring [Member] | Level 2 | Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale securities	14,190		17,164
Fair Value, Measurements, Recurring [Member] | Level 2 | Certificates of deposit
Fair value hierarchy for its financial assets
Available-for-sale securities	405		$ 2,676
Fair Value, Measurements, Recurring [Member] | Level 2 | Commercial Paper
Fair value hierarchy for its financial assets
Available-for-sale securities	$ 650

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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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