Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Non-cancellable Lease Terms

Commitments.    We lease office space and certain equipment under operating leases that expire at various times through 2020. Future minimum lease payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year as of December 31, 2017, were as follows:

Year Ending December 31,	Operating Leases
2018		723
2019		338
2020		84
	$	1,145