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Fair Value Measurements (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 29, 2016 | Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Roll-forward of acquisition-related contingent consideration |  |  |  |  |
Fair value adjustments included in operating expenses |  | $ 1,000 | $ 4,400 |  |
Assets transferred between the fair value measurement classifications |  |  |  | $ 0 |
Liabilities transferred between the fair value measurement classifications |  |  |  | 0 |
Kolltan |  |  |  |  |
Roll-forward of acquisition-related contingent consideration |  |  |  |  |
Maximum amount of future consideration payable | $ 172,500 |  |  |  |
Fair Value Measurements | Level 2 |  |  |  |  |
Assets: |  |  |  |  |
Money market funds and cash equivalents |  |  |  | 44,622 | $ 20,445
Marketable securities |  |  |  | 87,822 | 147,315
Total financial assets at fair value |  |  |  | 132,444 | 167,760
Fair Value Measurements | Level 3 |  |  |  |  |
Liabilities: |  |  |  |  |
Kolltan acquisition contingent consideration |  | 48,600 | 44,200 | 48,600 | 44,200
Total financial liabilities at fair value |  |  |  | 48,600 | 44,200
Roll-forward of acquisition-related contingent consideration |  |  |  |  |
Balance at beginning of period |  |  | 44,200 |  |
Balance at end of period |  | 48,600 | 48,600 |  |
Fair Value Measurements | Fair value |  |  |  |  |
Assets: |  |  |  |  |
Money market funds and cash equivalents |  |  |  | 44,622 | 20,445
Marketable securities |  |  |  | 87,822 | 147,315
Total financial assets at fair value |  |  |  | 132,444 | 167,760
Liabilities: |  |  |  |  |
Kolltan acquisition contingent consideration |  | 48,600 | 44,200 | 48,600 | 44,200
Total financial liabilities at fair value |  |  |  | 48,600 | 44,200
Roll-forward of acquisition-related contingent consideration |  |  |  |  |
Balance at beginning of period |  |  | 44,200 |  |
Balance at end of period |  | 48,600 | 48,600 |  |
Fair Value Measurements | Fair value | Level 3 |  |  |  |  |
Roll-forward of acquisition-related contingent consideration |  |  |  |  |
Fair value adjustments included in operating expenses |  | 1,000 |  |  |
Fair Value Measurements | Fair value | Level 3 | Other Long-Term Liabilities |  |  |  |  |
Liabilities: |  |  |  |  |
Kolltan acquisition contingent consideration |  | 48,600 | 44,200 | $ 48,600 | $ 44,200
Roll-forward of acquisition-related contingent consideration |  |  |  |  |
Balance at beginning of period |  |  | 44,200 |  |
Fair value adjustments included in operating expenses |  |  | 4,400 |  |
Balance at end of period |  | $ 48,600 | $ 48,600 |  |

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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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