CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue:
Total revenue	$ 33,671	$ 37,453
Cost of sales, excluding depreciation and amortization:
Selling, general and administrative expenses	(14,740)	(15,622)
Stock-based compensation expense	(2,080)	(1,251)
Acquisition related transaction expenses	(844)	(228)
Depreciation and amortization	(9,700)	(11,120)
Net operating loss	(702)	(852)
Other (expense) income
Interest income	33	93
Interest expense	(4,498)	(5,162)
Change in fair value of earnout liability	(2,263)	3,754
Change in fair value of derivative liability	1,220	1,553
Other finance income	1,164	199
Total other (expense) income, net	(4,344)	437
Loss before income taxes	(5,046)	(415)
Income tax benefit (expense)	93	(83)
Net loss	(4,953)	(498)
Other comprehensive (loss)/income:
Foreign currency translation (loss)/gain	(484)	298
Change in fair value of hedging instrument	(2,123)
Reclassification of gain on hedging instrument to comprehensive income	1,473
Actuarial gains on pension plan	893	1,302
Other comprehensive (loss)/income	(241)	1,600
Comprehensive (loss)/income	$ (5,194)	$ 1,102
Net loss per common share - basic and diluted (in dollars per share)	$ (0.24)	$ (0.02)
Weighted average number of shares outstanding during the period - basic and diluted (in shares)	20,959,626	20,855,124
Service [Member]
Revenue:
Total revenue	$ 30,793	$ 33,233
Cost of sales, excluding depreciation and amortization:
Cost of goods and services sold	(5,361)	(6,017)
Hardware [Member]
Revenue:
Total revenue	2,878	4,220
Cost of sales, excluding depreciation and amortization:
Cost of goods and services sold	$ (1,648)	$ (4,067)