Other Current Assets (Tables)

6 Months Ended

Jun. 30, 2019

Other Current Assets Disclosure [Abstract]

Schedule of Other Current Assets [Table Text Block]

	As of  June 30,  2019		As of December 31, 2018
Sales and use taxes	$	376	$	180
Prepaid expenses	281		241
Other	175		183
Other current assets	$	832	$	604