Related party transactions:	6 Months Ended
Jun. 30, 2019
Related party transactions:
Related party transactions:	8. Related party transactions: Office leases The Company’s headquarters is located in an office building owned by Sodium LLC whose owner is the Company’s Chief Executive Officer. The fixed annual rent for the headquarters building is $1.0 million per year plus an allocation of taxes and utilities. The lease began in May 2015 and the lease term is for five years which is cancellable by the Company upon 60 days’ notice. The Company’s audit committee reviews and approves all transactions with related parties. The Company paid $0.5 million and $0.5 million in the three months ended June 30, 2019 and 2018, respectively, and $0.9 million and $0.8 million in the six months ended June 30, 2019 and 2018, respectively, for rent and related costs (including taxes and utilities) to Sodium LLC for this lease.

Related party transactions:

6 Months Ended

Jun. 30, 2019

8. Related party transactions:

Office leases

The Company’s headquarters is located in an office building owned by Sodium LLC whose owner is the Company’s Chief Executive Officer. The fixed annual rent for the headquarters building is $1.0 million per year plus an allocation of taxes and utilities. The lease began in May 2015 and the lease term is for five years which is cancellable by the Company upon 60 days’ notice. The Company’s audit committee reviews and approves all transactions with related parties. The Company paid $0.5 million and $0.5 million in the three months ended June 30, 2019 and 2018, respectively, and $0.9 million and $0.8 million in the six months ended June 30, 2019 and 2018, respectively, for rent and related costs (including taxes and utilities) to Sodium LLC for this lease.