Other Long-Term Assets (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Cash surrender value of corporate-owned life insurance policies	$ 4,806	$ 4,654
Deferred commissions	32,337	32,455
Restricted cash	59	62
Operating lease assets	23,168	22,308
Strategic investments	29,500	9,500
Warrants for strategic investment	2,211	2,211
Prepaid expenses, deposits and other	10,839	8,727
Total other long-term assets	102,920	79,917
Investment, impairment recorded	0
Increase of cost basis recognized	2,400
Other Assets
Schedule of Investments [Line Items]
Fair value of warrants		$ 400
RapidSos
Schedule of Investments [Line Items]
Strategic investments	$ 20,000

Increase in cost basis of investment in equity security without readily determinable fair value.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as noncurrent.

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Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

No definition available.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount of investment in equity security without readily determinable fair value.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount of noncurrent assets classified as other.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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