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Marketable Securities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 200,966,000 | $ 142,882,000
Gross Unrealized Gains | 56,000 | 44,000
Gross Unrealized Losses | (138,000) | (49,000)
Fair Value | 200,884,000 | 142,877,000
Available-for-sale securities, mature in one year or less, amortized cost basis | 192,985,000 |
Available-for-sale securities, mature in one year or less, fair value | 192,898,000 |
Available-for-sale securities, maturing between one and five years, amortized cost basis | 7,981,000 |
Available-for-sale securities, maturing between one and five years, fair value | 7,986,000 |
Available-for-sale securities, other than temporary impairment losses | 0 | 0
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,826,000 | 9,354,000
Gross Unrealized Gains | 0 | 1,000
Gross Unrealized Losses | (1,000) | (6,000)
Fair Value | 4,825,000 | 9,349,000
Government-sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 29,764,000 | 22,055,000
Gross Unrealized Gains | 5,000 | 1,000
Gross Unrealized Losses | (10,000) | (9,000)
Fair Value | 29,759,000 | 22,047,000
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 166,376,000 | 111,473,000
Gross Unrealized Gains | 51,000 | 42,000
Gross Unrealized Losses | (127,000) | (34,000)
Fair Value | $ 166,300,000 | $ 111,481,000

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt 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 (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: 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 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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