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Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Total available-for-sale securities |  |
Amortized Cost | $ 65,164 | $ 47,807
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | (35) | (27)
Estimated Fair Value | 65,130 | 47,780
Available-for-sale securities in a loss position |  |
Estimated Fair Value | 47,797 | 44,781
Investments that had been in a continuous loss position for more than 12 months | 0 | 0
Realized gains | 0 | 0
U.S. treasuries |  |
Total available-for-sale securities |  |
Amortized Cost | 42,245 | 33,914
Gross Unrealized Losses | (17) | (19)
Estimated Fair Value | 42,228 | 33,895
Available-for-sale securities in a loss position |  |
Estimated Fair Value | 37,275 | 33,895
Corporate debt |  |
Total available-for-sale securities |  |
Amortized Cost | 10,540 | 10,894
Gross Unrealized Losses | (18) | (8)
Estimated Fair Value | 10,522 | 10,886
Available-for-sale securities in a loss position |  |
Estimated Fair Value | 10,522 | 10,886
Commercial paper |  |
Total available-for-sale securities |  |
Amortized Cost | 12,379 | 2,999
Gross Unrealized Gains | 1 |
Estimated Fair Value | $ 12,380 | $ 2,999

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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=73527792&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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