Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2018

Prepaid Expenses And Other Assets [Abstract]

Prepaid Expenses And Other Current Assets

	December31, 2018	December31, 2017
Prepaid voyage costs	$            134	$              14
Inventory	1,004	220
Other	757	671
Total prepaid expenses and other current assets	$1,895	$905