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Fair Value of Financial Instruments - Fair Value Hierarchy for Financial Assets (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair value hierarchy for its financial assets
Total assets	$ 11,103	$ 18,458
Money market funds
Fair value hierarchy for its financial assets
Available-for-sale Securities	3,203	2,238
U.S. government-sponsored enterprise bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities	2,900	7,525
Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale Securities	5,000	8,255
Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities		200
Certificates of deposit
Fair value hierarchy for its financial assets
Available-for-sale Securities		240
Level 1
Fair value hierarchy for its financial assets
Total assets	3,203	2,238
Level 1 | Money market funds
Fair value hierarchy for its financial assets
Available-for-sale Securities	3,203	2,238
Level 2
Fair value hierarchy for its financial assets
Total assets	7,900	16,220
Level 2 | U.S. government-sponsored enterprise bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities	2,900	7,525
Level 2 | Corporate notes
Fair value hierarchy for its financial assets
Available-for-sale Securities	$ 5,000	8,255
Level 2 | Municipal Bonds
Fair value hierarchy for its financial assets
Available-for-sale Securities		200
Level 2 | Certificates of deposit
Fair value hierarchy for its financial assets
Available-for-sale Securities		$ 240

X

- 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
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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