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)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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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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-Section 25
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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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-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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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	6 Months Ended
Marketable Securities (Details) $ in Thousands	Jun. 30, 2017 USD ($) security	Dec. 31, 2016 USD ($) security	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value	$ 135,110	$ 258,567	$ 120,554	$ 159,678
Cash and cash equivalents, Fair Value	135,110	258,567
Marketable securities, Amortized Cost Value	79,603	73,808
Marketable securities, Gross Unrealized Gains	12	78
Marketable Securities, Gross Unrealized Losses	(9)	(6)
Marketable securities, Fair Value	$ 79,606	$ 73,880
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	13
Fair value of debt securities in an unrealized loss position for less than 12 months	$ 33,700	$ 35,700
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 Value	$ 34,918	19,317
Marketable securities, Gross Unrealized Gains	0	0
Marketable Securities, Gross Unrealized Losses	(9)	(2)
Marketable securities, Fair Value	34,909	19,315
Domestic corporate commercial paper
Available-for-sale marketable securities and cash and cash equivalents
Marketable securities, Amortized Cost Value	44,685	31,852
Marketable securities, Gross Unrealized Gains	12	78
Marketable Securities, Gross Unrealized Losses	0	0
Marketable securities, Fair Value	44,697	31,930
Asset-backed securities
Available-for-sale marketable securities and cash and cash equivalents
Marketable securities, Amortized Cost Value		22,639
Marketable securities, Gross Unrealized Gains		0
Marketable Securities, Gross Unrealized Losses		(4)
Marketable securities, Fair Value		22,635
Cash
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value	98,201	77,443
Cash and cash equivalents, Fair Value	98,201	77,443
Money market
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value	30,573	173,631
Cash and cash equivalents, Fair Value	30,573	173,631
Domestic corporate commercial paper
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value		5,487
Cash and cash equivalents, Fair Value		5,487
Domestic corporate debt securities
Available-for-sale marketable securities and cash and cash equivalents
Cash and cash equivalents, Amortized Cost Value	6,336	2,006
Cash and cash equivalents, Fair Value	$ 6,336	$ 2,006