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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 31, 2015 | Mar. 31, 2013
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | $ 252,737 | $ 270,921 |  |  |
Investment in non-marketable security |  |  |  |  |
Impairment of Investment in non-marketable equity security | 0 | 600 | $ 1,400 |  |
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 | 77,804 | 124,938 |  |  |
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 | 14,110 |  |  |  |
Corporate notes, bonds and commercial paper |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 160,823 | 145,983 |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 252,737 | 270,921 |  |  |
Fair Value, Measurements, Recurring [Member] | Money market funds |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 77,804 | 124,938 |  |  |
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 | 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 | 160,823 | 145,983 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 79,068 | 124,938 |  |  |
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 | 77,804 | 124,938 |  |  |
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 |  |  |  |
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 | 1,264 | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |  |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |
Total available-for-sale securities | 173,669 | 145,983 |  |  |
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 | 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 | 159,559 | 145,983 |  |  |
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 |  |  |  |
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 |  | 0 |  |  | $ 2,000
Impairment of Investment in non-marketable equity security |  | 600 |  |  |
Nonrecurring basis | Level 1 |  |  |  |  |
Investment in non-marketable security |  |  |  |  |
Fair Value |  | 0 |  |  |
Nonrecurring basis | Level 2 |  |  |  |  |
Investment in non-marketable security |  |  |  |  |
Fair Value |  | 0 |  |  |
Nonrecurring basis | Level 3 |  |  |  |  |
Investment in non-marketable security |  |  |  |  |
Fair Value |  | $ 0 |  |  |

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 + Details
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