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Marketable Securities and Fair Value Measurements - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Assets |  |
Marketable Securities | $ 83,973 | $ 85,372
Total | 123,892 | 114,347
Level 1 |  |
Financial Assets |  |
Total | 39,919 | 28,975
Level 2 |  |
Financial Assets |  |
Total | 83,973 | 85,372
Cash |  |
Financial Assets |  |
Cash and Cash Equivalents | 27,346 | 18,672
Cash | Level 1 |  |
Financial Assets |  |
Cash and Cash Equivalents | 27,346 | 18,672
Cash equivalents |  |
Financial Assets |  |
Cash and Cash Equivalents | 12,573 | 10,303
Cash equivalents | Level 1 |  |
Financial Assets |  |
Cash and Cash Equivalents | 12,573 | 10,303
Certificates of deposit |  |
Financial Assets |  |
Marketable Securities | 15,993 | 12,508
Certificates of deposit | Level 2 |  |
Financial Assets |  |
Marketable Securities | 15,993 | 12,508
Corporate securities |  |
Financial Assets |  |
Marketable Securities | 40,940 | 42,732
Corporate securities | Level 2 |  |
Financial Assets |  |
Marketable Securities | 40,940 | 42,732
U.S. Treasury and agency securities |  |
Financial Assets |  |
Marketable Securities | 3,482 | 5,176
U.S. Treasury and agency securities | Level 2 |  |
Financial Assets |  |
Marketable Securities | 3,482 | 5,176
Commercial paper |  |
Financial Assets |  |
Marketable Securities | 9,216 | 11,469
Commercial paper | Level 2 |  |
Financial Assets |  |
Marketable Securities | 9,216 | 11,469
Asset-backed securities |  |
Financial Assets |  |
Marketable Securities | 14,342 | 13,487
Asset-backed securities | Level 2 |  |
Financial Assets |  |
Marketable Securities | $ 14,342 | $ 13,487

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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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