Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Future Minimum Annual Lease Payments for Operating Leases

Future minimum annual lease payments under existing operating lease commitments are as follows:

Year ending December 31:
2018		1,225
2019		1,227
2020		1,229
2021		1,162
2022		279
Total	$	5,122