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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Oct. 31, 2015 | Mar. 31, 2013
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | $ 121,151 | $ 252,737 |  |  |
Investment in non-marketable security |  |  |  |  |
Impairment of Investment in non-marketable equity security | 0 | 0 | $ 600 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) |  |  |  | $ 1,264 |
Money market funds |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 10,681 | 77,804 |  |  |
US Treasury and Government Short-term Debt Securities [Member] |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 48,292 | 14,110 |  |  |
Corporate notes, bonds and commercial paper |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 62,178 | 160,823 |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 121,151 | 252,737 |  |  |
Fair Value, Measurements, Recurring [Member] | Money market funds |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 10,681 | 77,804 |  |  |
Fair Value, Measurements, Recurring [Member] | US Treasury and Government Short-term Debt Securities [Member] |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 48,292 | 14,110 |  |  |
Fair Value, Measurements, Recurring [Member] | Corporate notes, bonds and commercial paper |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 62,178 | 160,823 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 10,984 | 79,068 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 1 | Money market funds |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 10,681 | 77,804 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 1 | US Treasury and Government Short-term Debt Securities [Member] |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 0 | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 1 | Corporate notes, bonds and commercial paper |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 303 | 1,264 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 110,167 | 173,669 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 | Money market funds |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 0 | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 | US Treasury and Government Short-term Debt Securities [Member] |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 48,292 | 14,110 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 | Corporate notes, bonds and commercial paper |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 61,875 | 159,559 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 0 | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 | Money market funds |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 0 | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 | US Treasury and Government Short-term Debt Securities [Member] |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 0 | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 | Corporate notes, bonds and commercial paper |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | $ 0 | $ 0 |  |  |
Nonrecurring basis |  |  |  |  |
Investment in non-marketable security |  |  |  |  |
Carrying Value |  |  |  |  | $ 2,000
Impairment of Investment in non-marketable equity security |  |  | $ 600 |  |

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + 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 210.5-02.12) -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 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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