Commitments

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments

Commitments

Operating Lease

We rent office space under an operating lease that expires on March 31, 2019. The lease allows us to terminate the lease any time after March 31, 2017 without a penalty. We do not expect to renew this lease.

In September 2018, we entered into a non-cancelable operating lease agreement to sublease approximately 44,000 square feet of office space for our corporate headquarters. This lease commenced January 15, 2019 and expires November 30, 2020.

Future minimum annual operating lease payments are as follows:

Year ending December 31:
2019	$	1,043
2020	952
Total future operating lease payments	$	1,995

Rental payments are charged to expense on a straight-line basis over the period of the lease. Rent expense was $0.2 million, $0.2 million and $0.1 million during the years ended December 31, 2018, 2017 and 2016, respectively.

Purchase Commitments

As of December 31, 2018, we had purchase commitments totaling $15.9 million.