Segments (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment									2
Number of reportable segments | segment									2
Financial information relating to the Company’s operating segments
Net Sales									$ 266,687	$ 200,162	$ 205,687
Gross profit	$ 10,526	$ 12,517	$ 15,951	$ 12,200	$ 7,654	$ 6,160	$ 8,961	$ 9,772	51,194	32,547	39,158
General and administrative expenses	10,484	10,739	9,277	7,405	7,538	7,942	8,302	8,063	37,905	31,845	35,588
Operating income (loss)	42	$ 1,778	$ 6,674	$ 4,795	116	$ (1,782)	$ 659	$ 1,709	13,289	702	3,570
Interest expense									(1,563)	(3,058)	(3,545)
Other income, net									201	666
Loss on debt extinguishment										(1,681)	(1,449)
Foreign currency gain (loss), net									(140)	(24)	75
Identifiable assets	140,845				81,330				140,845	81,330	92,335
Depreciation expense									2,348	1,915	1,842
Amortization expense									1,052	1,067	735
Capital expenditures									4,131	2,041	1,550
Domestic
Financial information relating to the Company’s operating segments
Net Sales									261,526	195,698	202,092
Gross profit									48,997	30,683	37,582
General and administrative expenses									36,053	30,127	33,926
Operating income (loss)									12,944	556	3,656
Identifiable assets	134,841				76,270				134,841	76,270	86,531
Depreciation expense									2,209	1,877	1,800
Amortization expense									797	798	330
Capital expenditures									4,011	1,892	1,479
International
Financial information relating to the Company’s operating segments
Net Sales									5,161	4,464	3,595
Gross profit									2,197	1,864	1,576
General and administrative expenses									1,852	1,718	1,662
Operating income (loss)									345	146	(86)
Identifiable assets	$ 6,004				$ 5,060				6,004	5,060	5,804
Depreciation expense									139	38	42
Amortization expense									255	269	405
Capital expenditures									$ 120	$ 149	$ 71