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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2020
Fair Value Disclosures [Abstract] |
Assets And Liabilities Measured At Fair Value | The following table presents fair value information related to the Company's assets and liabilities measured at amortized cost on the condensed consolidated balance sheets with the exception of the interest rate swap, which is measured at fair value:
| Fair Value Measurements at September 30, 2020
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market fund deposits and term deposits | $ | 269,955 |  |  | $ | 269,955 |  |  | $ | — |  |  | $ | — |
Commercial paper | 126,563 |  |  | — |  |  | 126,563 |  |  | — |
Corporate bonds | 25,142 |  |  | — |  |  | 25,142 |  |  | — |
U.S. Treasury and agency obligations | 11,799 |  |  | — |  |  | 11,799 |  |  | — |
Short-term investments: |  |  |  |  |  |  |
Corporate bonds | 183,827 |  |  | — |  |  | 183,827 |  |  | — |
Commercial paper | 316,167 |  |  | — |  |  | 316,167 |  |  | — |
U.S. Treasury and agency obligations | 38,144 |  |  | — |  |  | 38,144 |  |  | — |
Total | $ | 971,597 |  |  | $ | 269,955 |  |  | $ | 701,642 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Long-term debt | $ | 39,436 |  |  | $ | — |  |  | $ | 39,436 |  |  | $ | — |
Interest rate swap | 666 |  |  | — |  |  | 666 |  |  | — |
Total | $ | 40,102 |  |  | $ | — |  |  | $ | 40,102 |  |  | $ | — |
| Fair Value Measurements at December 31, 2019
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market fund deposits and term deposits | $ | 155,080 |  |  | $ | 155,080 |  |  | $ | — |  |  | $ | — |
Commercial paper | 54,712 |  |  | — |  |  | 54,712 |  |  | — |
Short-term investments: |  |  |  |  |  |  |
Corporate bonds | 259,422 |  |  | 259,422 |  |  | — |  |  | — |
Commercial paper | 236,752 |  |  | — |  |  | 236,752 |  |  | — |
Certificate of deposit | 6,501 |  |  | 6,501 |  |  | — |  |  | — |
Long-term investments and other assets: |  |  |  |  |  |  |
Auction rate securities | 592 |  |  | — |  |  | — |  |  | 592 |
Interest rate swaps | 13 |  |  | — |  |  | 13 |  |  | — |
Total | $ | 713,072 |  |  | $ | 421,003 |  |  | $ | 291,477 |  |  | $ | 592 |
Liabilities |  |  |  |  |  |  |
Long-term debt | $ | 42,004 |  |  | $ | — |  |  | $ | 42,004 |  |  | $ | — |
Contingent purchase consideration | 273 |  |  | — |  |  | — |  |  | 273 |
Total | $ | 42,277 |  |  | $ | — |  |  | $ | 42,004 |  |  | $ | 273 |
Fair Value, Assets Measured on Recurring Basis | The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Auction rate securities |  |  |  |  |  |  |
Balance, beginning of period | $ | 596 |  |  | $ | 852 |  |  | $ | 592 |  |  | $ | 847 |
Redemptions | (596) |  |  | (264) |  |  | (596) |  |  | (264) |
Change in fair value and accretion | — |  |  | 2 |  |  | 4 |  |  | 7 |
Balance, end of period | $ | — |  |  | $ | 590 |  |  | $ | — |  |  | $ | 590 |
Contingent purchase consideration |  |  |  |  |  |  |
Balance, beginning of period | $ | — |  |  | $ | 300 |  |  | $ | 273 |  |  | $ | 898 |
Cash payments | — |  |  | — |  |  | (272) |  |  | (632) |
Foreign exchange adjustment | — |  |  | (3) |  |  | (1) |  |  | 31 |
Balance, end of period | $ | — |  |  | $ | 297 |  |  | $ | — |  |  | $ | 297 |
Fair Value, Liabilities Measured on Recurring Basis | The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Auction rate securities |  |  |  |  |  |  |
Balance, beginning of period | $ | 596 |  |  | $ | 852 |  |  | $ | 592 |  |  | $ | 847 |
Redemptions | (596) |  |  | (264) |  |  | (596) |  |  | (264) |
Change in fair value and accretion | — |  |  | 2 |  |  | 4 |  |  | 7 |
Balance, end of period | $ | — |  |  | $ | 590 |  |  | $ | — |  |  | $ | 590 |
Contingent purchase consideration |  |  |  |  |  |  |
Balance, beginning of period | $ | — |  |  | $ | 300 |  |  | $ | 273 |  |  | $ | 898 |
Cash payments | — |  |  | — |  |  | (272) |  |  | (632) |
Foreign exchange adjustment | — |  |  | (3) |  |  | (1) |  |  | 31 |
Balance, end of period | $ | — |  |  | $ | 297 |  |  | $ | — |  |  | $ | 297 |
Schedule of Effective Maturity Dates of Held To Maturity Investments | The following table presents the effective maturity dates of held-to-maturity and available-for-sale debt investments as of September 30, 2020 and December 31, 2019:
| September 30, 2020 |  | December 31, 2019
| Book Value |  | Fair Value |  | Book Value |  | Fair Value
Investment maturity |  |  |  |  |  |  |
Held-to-maturity: |  |  |  |  |  |  |
Less than 1 year | $ | 537,696 |  |  | $ | 538,138 |  |  | $ | 502,546 |  |  | $ | 502,675 |
Available-for-sale: |  |  |  |  |  |  |
Greater than 5 years | $ | — |  |  | $ | — |  |  | $ | 592 |  |  | $ | 592 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + 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=117815213&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=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: 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=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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