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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table summarizes the financial assets and liabilities required to be measured at fair value on a recurring basis as of June 30, 2019 (in thousands):
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Unobservable Inputs (Level 3)
Assets: |  |  |  |  |
Money market instruments | $ | 3,099 |  |  | $ | — |  |  | $ | — |
Treasury bills | — |  |  | 307,490 |  |  | — |
Corporate bonds | — |  |  | 278,991 |  |  | — |
Asset-backed securities | — |  |  | 145,432 |  |  | — |
Sovereign bonds | — |  |  | 20,823 |  |  | — |
Agency bonds | — |  |  | 13,686 |  |  | — |
Municipal bonds | — |  |  | 6,097 |  |  | — |
Economic hedge forward contracts | — |  |  | 20 |  |  | — |
Liabilities: |  |  |  |  |
Economic hedge forward contracts | — |  |  | 13 |  |  | — |
Contingent consideration liabilities | — |  |  | — |  |  | 1,691 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The following table summarizes the activity for the Company's liability measured at fair value using Level 3 inputs for the six-month period ended June 30, 2019 (in thousands):
Balance as of December 31, 2018 | $ | 2,554 |
Fair value adjustment to GVi contingent consideration | (1,019 | )
Fair value adjustment to Chiaro contingent consideration | 156 |
Balance as of June 30, 2019 | $ | 1,691 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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