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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | $ 43,400 | $ 44,200
Fair Value Measurements | Level 2 |  |
Assets: |  |
Money market funds and cash equivalents | 24,061 | 20,445
Marketable securities | 99,139 | 147,315
Total financial assets at fair value | 123,200 | 167,760
Fair Value Measurements | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | 43,400 | 44,200
Total financial liabilities at fair value | 43,400 | 44,200
Fair Value Measurements | Fair value |  |
Assets: |  |
Money market funds and cash equivalents | 24,061 | 20,445
Marketable securities | 99,139 | 147,315
Total financial assets at fair value | 123,200 | 167,760
Liabilities: |  |
Kolltan acquisition contingent consideration | 43,400 | 44,200
Total financial liabilities at fair value | $ 43,400 | $ 44,200

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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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