Available-for-Sale Securities (Details)	3 Months Ended
Mar. 31, 2016 USD ($) item
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 28,744,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	16,000.00
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax, Total	2,000.00
Fair Value	28,758,000
Unrealized loss position, available-for-sale securities	$ 6,100,000
Number of available-for-sale securities in an unrealized loss position \| item	7
Proceeds from sales of available for sale securities	$ 3,300,000
Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	23,122,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	14,000.00
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax, Total	2,000.00
Fair Value	23,134,000
US Government-sponsored Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	5,622,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,000.00
Fair Value	$ 5,624,000

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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
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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.

+ References

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-Publisher FASB
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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.

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-Publisher FASB
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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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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.

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