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REVENUE
3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
REVENUE
REVENUE

The Company sells separately priced service contracts, which range from 12 months to 36 months, to owners of its hemodynamic monitors. The Company invoices the customer the total amount of consideration at the inception of the contract and recognizes revenue ratably over the term of the contract. As of March 31, 2019 and December 31, 2018, $7.9 million and $7.6 million, respectively, of deferred revenue associated with outstanding service contracts was recorded in “Accounts Payable and Accrued Liabilities” and "Other Long-term Liabilities." During the three months ended March 31, 2019, the Company recognized as revenue $1.1 million that was included in the balance of deferred revenue as of December 31, 2018.