Other Current Assets (Tables)

3 Months Ended

Mar. 31, 2019

Other Current Assets Disclosure [Abstract]

Schedule of Other Current Assets [Table Text Block]

	As of March 31, 2019		As of December 31, 2018
Prepaid expenses	$	257	$	241
Sales and use taxes	228		180
Other	197		183
Other current assets	$	682	$	604