Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income (loss)	$ 7,817	$ (3,395)	$ (1,349)
Adjustments to reconcile net income to net cash used for operating activities
Depreciation and amortization of intangible assets and loan fees	3,614	4,074	3,140
Loss on disposition of property	20	42	28
Foreign exchange (gain) loss on liabilities	228	(28)	(300)
Stock based compensation expense	447
Deferred tax adjustment	3,690
Warranty settlement gain		(645)	1,449
Changes in assets and liabilities
Accounts receivable	(4,313)	(2,216)	(1,907)
Inventories	(9,718)	(542)	(10,399)
Prepaid expenses and other assets	(721)	2,037	(3,789)
Accounts payable	4,152	104	6,114
Accrued wages payable	694	(128)	827
Other accrued expenses	(28)	(229)	(229)
Net cash provided by (used in) operating activities	5,882	(926)	(6,415)
Cash flows from investing activities
Proceeds from disposition of property, plant, and equipment		1	12
Purchase of property, plant, and equipment and intangibles	(4,131)	(2,041)	(1,550)
Net cash used in investing activities	(4,131)	(2,040)	(1,538)
Cash flows from financing activities
Proceeds from issuance of long term debt	260,020	238,252	236,981
Principal payments on long term debt	(270,458)	(243,852)	(218,532)
Proceeds from Initial Public Offering (IPO) of Class A Shares, net of underwriting discounts and offering costs	104,010
Repayment of Preference notes	(55,960)
Change in restricted cash and deposits	50
Purchase of LLC units from Continuing LLC Owners	(2,133)	6,894	(6,944)
Principal payments on capital lease obligations	(116)	(93)	(382)
Payment of deferred financing fees and debt discount	(42)	(509)	(1,316)
Net cash provided by financing activities	35,371	692	9,807
Net change in cash and cash equivalents	37,122	(2,274)	1,854
Effect of exchange rate changes on cash and cash equivalents	7	(209)	26
Cash and cash equivalents, beginning of period	767	3,250	1,370
Cash and cash equivalents, end of period	37,896	767	3,250
Supplemental cash flow information
Interest paid	1,353	2,911	2,997
Property, plant, and equipment acquired through accounts payable	(80)	125	24
Capital lease additions	35	$ 188
Issuance of preference notes for LLC Interests	55,960
Non cash acquisition of intangibles			$ 350
Establishment of deferred tax asset from step-up in basis	9,441
Taxes paid	323
Accrued tax distribution	$ 597