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Marketable Securities - Summary of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Summary of available-for-sale securities |  |
Available-for-sale securities, Cost | $ 71,066 | $ 26,773
Available-for-sale securities, Estimated Fair Value | 70,868 | 26,675
Level 1 | Certificates of deposit |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 6,238 | 1,868
Unrecognized losses for less than 12 months, Estimated Fair value | 6,222 | 1,863
Unrecognized losses for more than 12 months, Cost | 102 | 0
Unrecognized losses for more than 12 months, Estimated Fair value | 100 | 0
Unrecognized gains, Cost | 2,088 | 3,320
Unrecognized gains, Estimated Fair value | 2,089 | 3,329
Available-for-sale securities, Cost | 8,428 | 5,188
Available-for-sale securities, Estimated Fair Value | 8,411 | 5,192
Level 2 | U.S. Treasury and agency notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 29,741 | 947
Unrecognized losses for less than 12 months, Estimated Fair value | 29,669 | 946
Unrecognized losses for more than 12 months, Cost | 137 | 0
Unrecognized losses for more than 12 months, Estimated Fair value | 135 | 0
Unrecognized gains, Cost | 152 | 857
Unrecognized gains, Estimated Fair value | 153 | 859
Available-for-sale securities, Cost | 30,030 | 1,804
Available-for-sale securities, Estimated Fair Value | 29,957 | 1,805
Level 2 | Corporate notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 18,230 | 11,658
Unrecognized losses for less than 12 months, Estimated Fair value | 18,159 | 11,592
Unrecognized losses for more than 12 months, Cost | 2,804 | 1,053
Unrecognized losses for more than 12 months, Estimated Fair value | 2,788 | 1,042
Unrecognized gains, Cost | 0 | 3,431
Unrecognized gains, Estimated Fair value | 0 | 3,435
Available-for-sale securities, Cost | 21,034 | 16,142
Available-for-sale securities, Estimated Fair Value | 20,947 | 16,069
Level 2 | Municipal notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 10,298 | 2,556
Unrecognized losses for less than 12 months, Estimated Fair value | 10,288 | 2,526
Unrecognized losses for more than 12 months, Cost | 999 | 271
Unrecognized losses for more than 12 months, Estimated Fair value | 987 | 269
Unrecognized gains, Cost | 277 | 812
Unrecognized gains, Estimated Fair value | 278 | 814
Available-for-sale securities, Cost | 11,574 | 3,639
Available-for-sale securities, Estimated Fair Value | $ 11,553 | $ 3,609

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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