Represents the number of available for sale securities in unrealized loss positions for more than twelve months.

No definition available.

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- Definition

Represents the maturity term of securities held, which were categorized neither as trading nor held-to-maturity.

+ References

No definition available.

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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- Definition

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.

+ References

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)
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

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-Publisher FASB
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.5-02.1)
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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Marketable Securities (Details) $ in Thousands	3 Months Ended
Marketable Securities (Details) $ in Thousands	Jun. 30, 2016 USD ($) security	Dec. 31, 2015 USD ($) security	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value	$ 120,554	$ 159,678	$ 44,370	$ 28,518
Cash and cash equivalents, Fair Value	120,554	159,678
Marketable securities, Amortized Cost	280,114	313,656
Available-for-sale securities, gross unrealized gains	207	155
Available-for-sale securities, gross unrealized losses	(19)	(150)
Marketable securities, Fair Value	$ 280,302	$ 313,661
Debt securities held in an unrealized loss position for more than 12 months \| security	0	0
Debt securities held in an unrealized loss position for less than 12 months \| security	15	57
Fair value of debt securities in an unrealized loss position for less than 12 months	$ 72,100	$ 225,700
Marketable securities, contractual term to maturity	1 year
Domestic corporate debt securities
Available-for-sale marketable securities and cash and cash equivalents
Marketable securities, Amortized Cost	$ 108,873	173,142
Available-for-sale securities, gross unrealized gains	6	0
Available-for-sale securities, gross unrealized losses	(19)	(107)
Marketable securities, Fair Value	108,860	173,035
Domestic corporate commercial paper
Available-for-sale marketable securities and cash and cash equivalents
Marketable securities, Amortized Cost	84,202	84,004
Available-for-sale securities, gross unrealized gains	175	154
Available-for-sale securities, gross unrealized losses	0	0
Marketable securities, Fair Value	84,377	84,158
Asset-backed securities
Available-for-sale marketable securities and cash and cash equivalents
Marketable securities, Amortized Cost	87,039	56,510
Available-for-sale securities, gross unrealized gains	26	1
Available-for-sale securities, gross unrealized losses	0	(43)
Marketable securities, Fair Value	87,065	56,468
Cash
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value	3,303	2,934
Cash and cash equivalents, Fair Value	3,303	2,934
Money market funds
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value	114,750	83,257
Cash and cash equivalents, Fair Value	114,750	83,257
Domestic corporate commercial paper
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value	2,501	39,984
Cash and cash equivalents, Fair Value	$ 2,501	39,984
Government-sponsored enterprise debt securities
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value		15,996
Cash and cash equivalents, Fair Value		15,996
Domestic corporate debt securities
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value		10,007
Cash and cash equivalents, Fair Value		10,007
Asset-backed securities
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value		7,500
Cash and cash equivalents, Fair Value		$ 7,500