Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2018

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following:

(in thousands)	September 30, 2018		December 31, 2017
Accrued salaries and other compensation	$	3,686	$	2,646
Insurance	1,511		507
Deferred revenues (contract liabilities)	1,267		762
Property, sales and other taxes	2,018		2,693
Other	430		361
	$	8,912	$	6,969