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Other Long-Term Assets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Oct. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]        
Cash surrender value of corporate-owned life insurance policies $ 4,225     $ 4,214
Deferred commissions 27,263     22,068
Restricted cash 59     56
Operating lease assets 22,368     9,653
Investment in unconsolidated affiliate 4,700   $ 4,700  
Investment, impairment recorded 0      
Warrants for unconsolidated affiliate 2,588      
Prepaid expenses, deposits and other 6,085     4,190
Total other long-term assets $ 67,288     $ 40,181
Flock Group Inc.        
Schedule of Investments [Line Items]        
Equity method investment, ownership percentage     5.00%  
Subsequent Event        
Schedule of Investments [Line Items]        
Investment in unconsolidated affiliate   $ 2,100    
Subsequent Event | Flock Group Inc.        
Schedule of Investments [Line Items]        
Equity method investment, ownership percentage   4.00%