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Marketable Securities and Fair Value Measurements - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Assets |  |
Marketable Securities | $ 85,595 | $ 85,372
Total | 116,175 | 114,347
Level 1 |  |
Financial Assets |  |
Total | 30,580 | 28,975
Level 2 |  |
Financial Assets |  |
Total | 85,595 | 85,372
Cash |  |
Financial Assets |  |
Cash and Cash Equivalents | 20,290 | 18,672
Cash | Level 1 |  |
Financial Assets |  |
Cash and Cash Equivalents | 20,290 | 18,672
Cash equivalents |  |
Financial Assets |  |
Cash and Cash Equivalents | 10,290 | 10,303
Cash equivalents | Level 1 |  |
Financial Assets |  |
Cash and Cash Equivalents | 10,290 | 10,303
Certificates of deposit |  |
Financial Assets |  |
Marketable Securities | 11,499 | 12,508
Certificates of deposit | Level 2 |  |
Financial Assets |  |
Marketable Securities | 11,499 | 12,508
Corporate securities |  |
Financial Assets |  |
Marketable Securities | 48,409 | 42,732
Corporate securities | Level 2 |  |
Financial Assets |  |
Marketable Securities | 48,409 | 42,732
U.S. Treasury and agency securities |  |
Financial Assets |  |
Marketable Securities | 5,181 | 5,176
U.S. Treasury and agency securities | Level 2 |  |
Financial Assets |  |
Marketable Securities | 5,181 | 5,176
Commercial paper |  |
Financial Assets |  |
Marketable Securities | 7,977 | 11,469
Commercial paper | Level 2 |  |
Financial Assets |  |
Marketable Securities | 7,977 | 11,469
Asset-backed securities |  |
Financial Assets |  |
Marketable Securities | 12,529 | 13,487
Asset-backed securities | Level 2 |  |
Financial Assets |  |
Marketable Securities | $ 12,529 | $ 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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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