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Unearned Revenues
6 Months Ended
Jun. 30, 2021
Deferred Revenue Disclosure [Abstract]  
UNEARNED REVENUES
(8) UNEARNED REVENUES

The Company records deferred revenues when cash payments are received or due in advance of its performance. The increase in the deferred revenue balance for the six months ended June 30, 2021 is primarily driven by $33.4 million of cash payments received in the current year for which the Company has not yet satisfied the performance obligations, offset by $35.1 million of revenues recognized that were included in the deferred revenue balance as of December 31, 2020.