Related-Party Transactions	9 Months Ended
Sep. 30, 2019
Related Party Transactions [Abstract]
Related-Party Transactions	10. RELATED-PARTY TRANSACTIONS Aircraft Lease— On August 30, 2014, a related party, Moelis & Company Manager LLC ("Manager"), acquired an aircraft with funds received solely from its managing member (Mr. Moelis). The aircraft is used and operated by the Company pursuant to a dry lease with Manager. The terms of the dry lease are comparable to the market rates of leasing from an independent third party. Pursuant to this dry lease arrangement, the lessee is obligated to bear its share of the costs of operating the aircraft. In addition, Mr. Moelis is the other lessee of the aircraft and shares the operating and related costs of the plane in proportion to his respective use pursuant to a cost sharing and operating agreement. On July 12, 2019, the Company terminated its aircraft dry lease with Manager, the lessor, and Mr. Moelis, the other lessee (the “Old Lease”) and the related cost sharing agreement with Mr. Moelis, which were set to expire by their terms on December 31, 2019, and entered into a new dry lease with Manager, the lessor, and Mr. Moelis, the other lessee (the “New Lease”) and cost sharing agreement with Mr. Moelis, which terminate on December 31, 2022. The terms of the New Lease and new cost sharing agreement are substantially similar to the Old Lease and related cost sharing agreement. For the three months ended September 30, 2019 and 2018, the Company incurred $413 and $468 in aircraft lease costs to be paid to Manager, respectively, and $1,349 and $1,404 for the nine months ended September 30, 2019 and 2018, respectively. Promissory Notes —As of September 30, 2019, there were $189 of unsecured promissory notes from employees held by the Company (December 31, 2018: $189). Any outstanding balances are reflected in accrued and other receivables on the condensed consolidated statements of financial condition. The notes held as of September 30, 2019 and December 31, 2018 bear a fixed interest rate of 4.00%. During the nine months ended September 30, 2019 and 2018, the Company received $0 and $366 of principal repayments and recognized interest income of $6 and $11, respectively, on such notes, which is included in other income and expenses on the condensed consolidated statements of operations. Services Agreement —In connection with the Company’s IPO, the Company entered into a services agreement with a related party, Moelis Asset Management LP, whereby the Company provides certain administrative services, technology, and office space to Moelis Asset Management LP for a fee. This fee totaled $60 and $170 for the three months ended September 30, 2019 and 2018, respectively, and $188 and $479 for the nine months ended September 30, 2019 and 2018, respectively. The amount of the fee is based upon the estimated usage and related expense of all shared services between the Company and Moelis Asset Management LP during the relevant period, and will be assessed periodically by Management as per the terms of the agreement. As of September 30, 2019 and December 31, 2018, there were no balances due from Moelis Asset Management LP. Moelis Australia —As of September 30, 2019 and December 31, 2018, the Company had $50 due from and $1,673 due to Moelis Australia, respectively, which are reflected in accrued and other receivables on the condensed consolidated statements of financial condition. These balances consist of amounts due to or from Moelis Australia for advisory services performed as well as billable expenses incurred by the Company on behalf of Moelis Australia during the period. The relationship between the Company and Moelis Australia is governed by a services agreement. Revenues —From time to time, the Company enters into advisory transactions with Moelis Asset Management LP and its affiliates. The Company earned revenues associated with such transactions of $0 for each of the three months ended September 30, 2019 and 2018, respectively, and $210 and $242 for the nine months ended September 30, 2019 and 2018, respectively.

Related-Party Transactions

9 Months Ended

Sep. 30, 2019

10. RELATED-PARTY TRANSACTIONS

Aircraft Lease— On August 30, 2014, a related party, Moelis & Company Manager LLC ("Manager"), acquired an aircraft with funds received solely from its managing member (Mr. Moelis). The aircraft is used and operated by the Company pursuant to a dry lease with Manager. The terms of the dry lease are comparable to the market rates of leasing from an independent third party. Pursuant to this dry lease arrangement, the lessee is obligated to bear its share of the costs of operating the aircraft. In addition, Mr. Moelis is the other lessee of the aircraft and shares the operating and related costs of the plane in proportion to his respective use pursuant to a cost sharing and operating agreement. On July 12, 2019, the Company terminated its aircraft dry lease with Manager, the lessor, and Mr. Moelis, the other lessee (the “Old Lease”) and the related cost sharing agreement with Mr. Moelis, which were set to expire by their terms on December 31, 2019, and entered into a new dry lease with Manager, the lessor, and Mr. Moelis, the other lessee (the “New Lease”) and cost sharing agreement with Mr. Moelis, which terminate on December 31, 2022. The terms of the New Lease and new cost sharing agreement are substantially similar to the Old Lease and related cost sharing agreement.

For the three months ended September 30, 2019 and 2018, the Company incurred $413 and $468 in aircraft lease costs to be paid to Manager, respectively, and $1,349 and $1,404 for the nine months ended September 30, 2019 and 2018, respectively.

Promissory Notes —As of September 30, 2019, there were $189 of unsecured promissory notes from employees held by the Company (December 31, 2018: $189). Any outstanding balances are reflected in accrued and other receivables on the condensed consolidated statements of financial condition. The notes held as of September 30, 2019 and December 31, 2018 bear a fixed interest rate of 4.00%. During the nine months ended September 30, 2019 and 2018, the Company received $0 and $366 of principal repayments and recognized interest income of $6 and $11, respectively, on such notes, which is included in other income and expenses on the condensed consolidated statements of operations.

Services Agreement —In connection with the Company’s IPO, the Company entered into a services agreement with a related party, Moelis Asset Management LP, whereby the Company provides certain administrative services, technology, and office space to Moelis Asset Management LP for a fee. This fee totaled $60 and $170 for the three months ended September 30, 2019 and 2018, respectively, and $188 and $479 for the nine months ended September 30, 2019 and 2018, respectively. The amount of the fee is based upon the estimated usage and related expense of all shared services between the Company and Moelis Asset Management LP during the relevant period, and will be assessed periodically by Management as per the terms of the agreement. As of September 30, 2019 and December 31, 2018, there were no balances due from Moelis Asset Management LP.

Moelis Australia —As of September 30, 2019 and December 31, 2018, the Company had $50 due from and $1,673 due to Moelis Australia, respectively, which are reflected in accrued and other receivables on the condensed consolidated statements of financial condition. These balances consist of amounts due to or from Moelis Australia for advisory services performed as well as billable expenses incurred by the Company on behalf of Moelis Australia during the period. The relationship between the Company and Moelis Australia is governed by a services agreement.

Revenues —From time to time, the Company enters into advisory transactions with Moelis Asset Management LP and its affiliates. The Company earned revenues associated with such transactions of $0 for each of the three months ended September 30, 2019 and 2018, respectively, and $210 and $242 for the nine months ended September 30, 2019 and 2018, respectively.