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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2020
Accounting Policies [Abstract] |
Schedule of Revenue Disaggregated by Geographic Region | The nature, amount, timing, and uncertainty of our revenue and how revenue and cash flows are affected by economic factors is most appropriately depicted by geographic region (using the location of the client as the basis of attributing revenue to the individual regions) as follows (in thousands):
|  | Quarter Ended |  |  | Six Months Ended |  |
|  | June 30, |  |  | June 30, |  |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |
Americas (principally the U.S.) |  | $ | 209,926 |  |  | $ | 214,390 |  |  | $ | 426,923 |  |  | $ | 425,120 |  |
Europe, Middle East, and Africa |  |  | 22,134 |  |  |  | 22,606 |  |  |  | 43,166 |  |  |  | 47,232 |  |
Asia Pacific |  |  | 8,261 |  |  |  | 8,860 |  |  |  | 15,849 |  |  |  | 18,297 |  |
Total revenue |  | $ | 240,321 |  |  | $ | 245,856 |  |  | $ | 485,938 |  |  | $ | 490,649 |  |
Fair Value Measurements | The following table represents the fair value hierarchy based upon three levels of inputs, of which Levels 1 and 2 are considered observable and Level 3 is unobservable, for our financial assets measured at fair value (in thousands):
|  | June 30, 2020 |  |  | December 31, 2019 |
|  | Level 1 |  |  | Level 2 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Total |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 29,240 |  |  | $ | — |  |  | $ | 29,240 |  |  | $ | 4,847 |  |  | $ | — |  |  | $ | 4,847 |
Commercial paper |  |  | — |  |  |  | 5,797 |  |  |  | 5,797 |  |  |  | — |  |  |  | 26,964 |  |  |  | 26,964 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  | — |  |  |  | 24,090 |  |  |  | 24,090 |  |  |  | — |  |  |  | 22,159 |  |  |  | 22,159 |
Asset-backed securities |  |  | — |  |  |  | 3,093 |  |  |  | 3,093 |  |  |  | — |  |  |  | 3,950 |  |  |  | 3,950 |
Total |  | $ | 29,240 |  |  | $ | 32,980 |  |  | $ | 62,220 |  |  | $ | 4,847 |  |  | $ | 53,073 |  |  | $ | 57,920 |
Carrying Value (Par Value for Convertible Debt) and Estimated Fair Value of Debt | We have chosen not to measure our debt at fair value, with changes recognized in earnings each reporting period. The following table indicates the carrying value (par value for convertible debt) and estimated fair value of our debt as of the indicated periods (in thousands):
|  | June 30, 2020 |  |  | December 31, 2019 |
|  | Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
|  | Value |  |  | Value |  |  | Value |  |  | Value |
2018 Credit Agreement (carrying value including current maturities) |  | $ | 132,188 |  |  | $ | 132,188 |  |  | $ | 136,875 |  |  | $ | 136,875 |
2016 Convertible debt (par value) |  |  | 230,000 |  |  |  | 238,625 |  |  |  | 230,000 |  |  |  | 262,775 |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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