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Fair Value Measurements (Fair value hierarchy for its financial assets and liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Level 1 [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities |  | $ 14,950 | $ 20,354
Level 1 [Member] | Money market funds [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities |  | 14,950 | 20,354
Level 1 [Member] | Government-backed security [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities |  | 0 | 0
Level 1 [Member] | Asset-backed securities [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities | [1] | 0 | 0
Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities | [2] | 0 | 0
Level 2 [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities |  | 186,137 | 143,221
Level 2 [Member] | Money market funds [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities |  | 0 | 0
Level 2 [Member] | Government-backed security [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities |  | 20,000 | 7,500
Level 2 [Member] | Asset-backed securities [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities | [1] | 28,924 | 46,624
Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities | [2] | 137,213 | 89,097
Level 3 [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities |  | 0 | 0
Level 3 [Member] | Money market funds [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities |  | 0 | 0
Level 3 [Member] | Government-backed security [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities |  | 0 | 0
Level 3 [Member] | Asset-backed securities [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities | [1] | 0 | 0
Level 3 [Member] | Corporate Debt Securities [Member] |  |  |
Assets |  |  |
Total cash equivalents and marketable securities | [2] | $ 0 | $ 0
[1] | Includes $8,185 classified as cash and cash equivalents (See Note 3).
[2] | Includes $20,404 classified as cash and cash equivalents (See Note 3).

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 + Details
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