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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of assets and liabilities carried at fair value | As of September 30, 2018 and December 31, 2017, our assets and liabilities carried at fair value on a recurring basis were as follows:
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
September 30, 2018 | (In thousands)
Assets |  |  |  |  |  |  |
Negotiable certificate of deposit | $ | — |  |  | $ | 15,000 |  |  | $ | — |  |  | $ | 15,000 |
Agency bond securities | — |  |  | 19,584 |  |  | — |  |  | 19,584 |
Agency mortgage-backed securities | — |  |  | 112,471 |  |  | — |  |  | 112,471 |
Municipal bonds | — |  |  | 477 |  |  | — |  |  | 477 |
Asset-backed securities | — |  |  | 76,345 |  |  | — |  |  | 76,345 |
Total assets | $ | — |  |  | $ | 223,877 |  |  | $ | — |  |  | $ | 223,877 |
Liabilities |  |  |  |  |  |  |
Contingent consideration | $ | — |  |  | $ | — |  |  | $ | 13,502 |  |  | $ | 13,502 |
December 31, 2017 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Corporate bonds | $ | — |  |  | $ | 1,000 |  |  | $ | — |  |  | $ | 1,000 |
U.S. Treasury notes | — |  |  | 10,875 |  |  | — |  |  | 10,875 |
Agency mortgage-backed securities | — |  |  | 120,034 |  |  | — |  |  | 120,034 |
Municipal bonds | — |  |  | 739 |  |  | — |  |  | 739 |
Asset-backed securities | — |  |  | 20,861 |  |  | — |  |  | 20,861 |
Total assets | $ | — |  |  | $ | 153,509 |  |  | $ | — |  |  | $ | 153,509 |
Liabilities |  |  |  |  |  |  |
Contingent consideration | $ | — |  |  | $ | — |  |  | $ | 17,358 |  |  | $ | 17,358 |
Schedule of changes in contingent consideration payable | The following table presents changes in our contingent consideration payable for the three and nine months ended September 30, 2018 and 2017, which is categorized in Level 3 of the fair value hierarchy:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
Balance, beginning of period | $ | 14,664 |  |  | $ | 21,911 |  |  | $ | 17,358 |  |  | $ | 8,634 |
Issuance | — |  |  | — |  |  | — |  |  | 18,000 |
Payments of contingent consideration | (1,162 | ) |  | (1,184 | ) |  | (3,856 | ) |  | (1,907 | )
Purchase accounting adjustment | — |  |  | — |  |  | — |  |  | 3,500 |
Change in fair value of contingent consideration | — |  |  | — |  |  | — |  |  | (7,500 | )
Balance, end of period | $ | 13,502 |  |  | $ | 20,727 |  |  | $ | 13,502 |  |  | $ | 20,727 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: 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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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