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Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Total available-for-sale securities |  |  |  |  |
Amortized Cost | $ 52,086 |  | $ 52,086 |  | $ 47,807
Gross Unrealized Gains | 1 |  | 1 |  |
Gross Unrealized Losses | (24) |  | (24) |  | (27)
Estimated Fair Value | 52,063 |  | 52,063 |  | 47,780
Available-for-sale securities in a loss position |  |  |  |  |
Estimated Fair Value | 38,182 |  | 38,182 |  | 44,781
Gross Unrealized Losses | (24) |  | (24) |  | (27)
Investments that had been in a continuous loss position for more than 12 months | 0 |  | 0 |  | 0
Realized gains | 0 | $ 0 | 0 | $ 0 |
Realized losses | 0 |  | 0 |  |
U.S. treasuries |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost | 36,538 |  | 36,538 |  | 33,914
Gross Unrealized Gains | 1 |  | 1 |  |
Gross Unrealized Losses | (12) |  | (12) |  | (19)
Estimated Fair Value | 36,527 |  | 36,527 |  | 33,895
Available-for-sale securities in a loss position |  |  |  |  |
Estimated Fair Value | 29,621 |  | 29,621 |  | 33,895
Gross Unrealized Losses | (12) |  | (12) |  | (19)
Corporate debt |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost | 8,573 |  | 8,573 |  | 10,894
Gross Unrealized Losses | (12) |  | (12) |  | (8)
Estimated Fair Value | 8,561 |  | 8,561 |  | 10,886
Available-for-sale securities in a loss position |  |  |  |  |
Estimated Fair Value | 8,561 |  | 8,561 |  | 10,886
Gross Unrealized Losses | (12) |  | (12) |  | (8)
Commercial paper |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost | 6,975 |  | 6,975 |  | 2,999
Estimated Fair Value | $ 6,975 |  | $ 6,975 |  | $ 2,999

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- Definition Amount before tax of unrealized gain 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 (b) -URI http://asc.fasb.org/extlink&oid=82897076&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=82897076&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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