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Revenue - Deferred Contract Acquisition Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Capitalized Contract Cost [Roll Forward]        
Beginning balance $ 28,171 $ 17,846 $ 25,184 $ 15,940
Capitalization of contract acquisition costs 9,672 4,221 16,158 8,446
Amortization of deferred contract acquisition costs (3,963) (2,585) (7,462) (4,904)
Ending balance $ 33,880 $ 19,482 $ 33,880 $ 19,482