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Investments - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Total available-for-sale securities |  |  |
Amortized Cost | $ 66,807 | $ 116,064 |
Gross Unrealized Gains |  | 10 |
Gross Unrealized Losses | (20) | (24) |
Estimated Fair Value | 66,787 | 116,050 |
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value | 43,788 | 68,275 |
Gross Unrealized Losses | (20) | (24) |
Short-term investments that had been in a continuous loss position for more than 12 months | 0 | 0 |
Realized gains or losses | 0 |  |
Other net |  |  |
Available-for-sale securities in a loss position |  |  |
Realized gains or losses |  | 0 | $ 0
U.S. treasuries |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 40,013 | 94,935 |
Gross Unrealized Gains |  | 6 |
Gross Unrealized Losses | (5) | (23) |
Estimated Fair Value | 40,008 | 94,918 |
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value | 20,002 | 64,922 |
Gross Unrealized Losses | (5) | (23) |
Government agency securities |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 10,020 | 12,985 |
Gross Unrealized Gains |  | 3 |
Gross Unrealized Losses | (8) |  |
Estimated Fair Value | 10,012 | 12,988 |
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value | 10,012 |  |
Gross Unrealized Losses | (8) |  |
Corporate debt |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 13,780 | 8,144 |
Gross Unrealized Gains |  | 1 |
Gross Unrealized Losses | (7) | (1) |
Estimated Fair Value | 13,773 | 8,144 |
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value | 13,774 | 3,353 |
Gross Unrealized Losses | (7) | $ (1) |
Commercial paper |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 2,994 |  |
Estimated Fair Value | $ 2,994 |  |

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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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- 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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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