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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value on Recurring Basis | Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 2018 (in thousands):
|  | Using |  |  |  |
|  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Fair Value as of December 31, 2018 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 9,433 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,433 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Failed Auction Security |  |  | — |  |  |  | — |  |  |  | 2,526 |  |  |  | 2,526 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration obligations |  |  | — |  |  |  | — |  |  |  | (408 | ) |  |  | (408 | )
Assets measured at fair value on a recurring basis included the following as of December 31, 2017 (in thousands):
|  | Using |  |  |  |
|  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Fair Value as of December 31, 2017 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 9,279 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,279 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Failed Auction Security |  |  | — |  |  |  | — |  |  |  | 2,525 |  |  |  | 2,525 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration obligation |  |  | — |  |  |  | — |  |  |  | (678 | ) |  |  | (678 | )
Quantitative Information about Level 3 Fair Value Measurements |
|  | Fair Value |  |  | Valuation Technique |  |  | Unobservable Input |  |  | Weighted Average |
Failed Auction Security |  | $ | 2,526 |  |  | Discounted cash flow |  |  |  | Cumulative probability of earning the maximum rate until maturity |  |  |  | 0.08 | %
|  |  |  |  |  |  |  |  |  |  | Cumulative probability of principal return prior to maturity |  |  |  | 93.69 | %
|  |  |  |  |  |  |  |  |  |  | Cumulative probability of default |  |  |  | 6.24 | %
|  |  |  |  |  |  |  |  |  |  | Liquidity risk premium |  |  |  | 5.00 | %
|  |  |  |  |  |  |  |  |  |  | Recovery rate in default |  |  |  | 40.00 | %
Change in Estimated Fair Values Calculated for Investment Valued on Recurring Basis Utilizing Level 3 Inputs | The change in the estimated fair value calculated for the investment valued on a recurring basis utilizing Level 3 inputs (i.e., the Failed Auction Security) for the year ended December 31, 2018 was as follows (in thousands):
Balance at the beginning of the period |  | $ | 2,525 |
Credit gain on available-for-sale security included in Other income (expense), net |  |  | 7 |
Gain included in Other comprehensive income (loss) |  |  | (6 | )
Balance at the end of the period |  | $ | 2,526 |
Change in Estimated Fair Value Calculated for Liabilities Valued on Recurring Basis Utilizing Level 3 Inputs | The change in the estimated fair value calculated for the liabilities valued on a recurring basis utilizing Level 3 inputs (i.e., the Contingent consideration obligations) for the year ended December 31, 2018 was as follows (in thousands):
Balance at the beginning of the period |  | $ | 678 |
Payments |  |  | (270 | )
Balance at the end of the period |  | $ | 408 |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of liabilities, 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). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + 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 (b) -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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 3: 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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- 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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