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Other Long-Term Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Feb. 28, 2021
Oct. 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]          
Cash surrender value of corporate-owned life insurance policies $ 4,654 $ 4,654     $ 4,214
Deferred commissions 32,455 32,455     22,068
Restricted cash 62 62     56
Operating lease assets 22,308 22,308     9,653
Investments in unconsolidated affiliate 9,500 9,500   $ 2,100  
Warrants for unconsolidated affiliate 2,211 2,211      
Prepaid expenses, deposits and other 8,727 8,727     4,190
Total other long-term assets 79,917 79,917     $ 40,181
Investment, impairment recorded   0      
Estimate of Fair Value Measurement          
Schedule of Investments [Line Items]          
Warrants for unconsolidated affiliate 2,600 $ 2,600      
Flock Group Inc.          
Schedule of Investments [Line Items]          
Increase of cost basis recognized 2,400        
Fair value of warrants decrease $ 400        
Subsequent Event | RapidSos          
Schedule of Investments [Line Items]          
Investments in unconsolidated affiliate     $ 20,000