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Marketable Securities (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Available-for-sale securities held
Amortized Cost	$ 39,708,000
Unrealized Gains	7,000
Unrealized Losses	(15,000)
Fair Value	39,700,000
Maturities
Available-for-sale securities with remaining maturities greater than one year	400,000	$ 0
U.S. government agency securities and treasuries
Available-for-sale securities held
Amortized Cost	25,013,000
Unrealized Gains	7,000
Unrealized Losses	(3,000)
Fair Value	25,017,000
Corporate debt securities
Available-for-sale securities held
Amortized Cost	14,695,000
Unrealized Gains	0
Unrealized Losses	(12,000)
Fair Value	$ 14,683,000

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Available-for-sale debt securities maturing greater than one year.

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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
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Topic 320
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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