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DEFERRED COMMISSIONS | 9 Months Ended
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Sep. 30, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
DEFERRED COMMISSIONS | 5. DEFERRED COMMISSIONS
(in thousands) | September 30, 2020 |  | December 31, 2019
Deferred commissions (1) | $ | 87,992 |  |  | $ | 85,314 |
(1) Included in other long-term assets.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
Amortization of deferred commissions (1) | $ | 8,861 |  |  | $ | 8,193 |  |  | $ | 24,922 |  |  | $ | 22,372 |
(1) Included in selling and marketing expense.

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