CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales	$ 237,842	$ 202,342	$ 154,969
Cost of sales	193,316	168,425	128,541
Gross profit	44,526	33,917	26,428
Operating expenses:
Research & development and engineering	10,439	7,377	4,713
Selling and service	7,545	5,925	6,666
General and administrative	11,575	8,299	5,244
Total operating expense	29,559	21,601	16,623
Operating income	14,967	12,316	9,805
Other expense:
Interest expense	657	1,023	1,340
Loss on debt extinguishment	270		485
Private placement warrant expense	28,031	448	382
Other expense, net	10		764
Total other expense	28,968	1,471	2,971
(Loss) income before income taxes	(14,001)	10,845	6,834
Income tax provision	4,759	4,143	2,773
Net (loss) income	(18,760)	6,702	4,061
Undistributed (loss) earnings	(18,760)	6,702	4,061
Common Shares [Member]
Other expense:
Undistributed (loss) earnings allocable to shares	(18,760)	6,702	1,548
Weighted-average preferred shares outstanding:
Basic	9,779,457	9,068,846	3,512,534
Diluted	9,779,457	9,068,846	3,512,534
Weighted-average common shares outstanding:
Basic	9,779,457	9,068,846	3,512,534
Diluted	9,779,457	9,068,846	3,512,534
Undistributed (loss) earnings per share - basic
Undistributed (loss) earnings per share - basic	$ (1.92)	$ 0.74	$ 0.44
Undistributed (loss) earnings per share - diluted
Undistributed (loss) earnings per share - diluted	$ (1.92)	$ 0.74	$ 0.44
Preferred Shares [Member]
Weighted-average preferred shares outstanding:
Basic
Diluted
Weighted-average common shares outstanding:
Basic
Diluted
Series A Convertible Preferred Shares [Member]
Other expense:
Undistributed (loss) earnings allocable to shares			$ 2,513
Undistributed (loss) earnings per share - basic
Undistributed (loss) earnings per share - basic
Undistributed (loss) earnings per share - diluted
Undistributed (loss) earnings per share - diluted