Installment Receivable	12 Months Ended
Dec. 31, 2018
Installment Receivable
Installment Receivable	(6) Installment Receivable We granted a bargain purchase option to a customer with respect to certain compressor packages leased to the customer. The bargain purchase option provides the customer with an option to acquire the equipment at a value significantly less than the fair market value at the end of the lease term, which is July 31, 2021. We accounted for this option as a sales type lease resulting in a current installment receivable included in other accounts receivable of $3.7 million and a long-term installment receivable of $6.9 million as of December 31, 2018. The USA Compression Predecessor had no capital lease installment receivables as of December 31, 2017. Revenue and interest income related to the capital lease is recognized over the lease term. We recognize maintenance revenue within Contract operations revenue and interest income within Interest expense, net. Maintenance revenue was $1.0 million for the year ended December 31, 2018. Interest income was $0.7 million for the year ended December 31, 2018. The USA Compression Predecessor had no capital lease revenue or maintenance revenue related to capital lease for the years ended December 31, 2017 or 2016.

(6) Installment Receivable

We granted a bargain purchase option to a customer with respect to certain compressor packages leased to the customer. The bargain purchase option provides the customer with an option to acquire the equipment at a value significantly less than the fair market value at the end of the lease term, which is July 31, 2021.

We accounted for this option as a sales type lease resulting in a current installment receivable included in other accounts receivable of $3.7 million and a long-term installment receivable of $6.9 million as of December 31, 2018. The USA Compression Predecessor had no capital lease installment receivables as of December 31, 2017.

Revenue and interest income related to the capital lease is recognized over the lease term. We recognize maintenance revenue within Contract operations revenue and interest income within Interest expense, net. Maintenance revenue was $1.0 million for the year ended December 31, 2018. Interest income was $0.7 million for the year ended December 31, 2018. The USA Compression Predecessor had no capital lease revenue or maintenance revenue related to capital lease for the years ended December 31, 2017 or 2016.