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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net sales $ 389,446 $ 347,995 $ 237,842
Cost of sales 326,612 280,950 193,316
Gross profit 62,834 67,045 44,526
Operating expenses:      
Research & development and engineering 21,681 16,900 10,439
Selling and service 11,658 9,686 7,545
General and administrative 15,718 13,402 11,575
Amortization of intangible assets 4,582 1,013  
Total operating expenses 53,639 41,001 29,559
Operating income 9,195 26,044 14,967
Other (income) expense:      
Interest expense 4,327 1,331 657
Contingent consideration 48 (3,840)  
Private placement warrant (income) expense (9,299) (6,169) 28,031
Loss on debt extinguishment     270
Other expense, net 229 183 10
Total other (income) expense (4,695) (8,495) 28,968
Income (loss) before income taxes 13,890 34,539 (14,001)
Income tax (benefit) provision (388) 10,813 4,759
Net income (loss) $ 14,278 $ 23,726 $ (18,760)
Common Shares [Member]      
Weighted-average common shares outstanding:      
Basic 10,808,005 10,706,780 9,779,457
Diluted 11,073,647 11,131,617 9,779,457
Earnings (loss) per common share      
Basic $ 1.32 $ 2.22 $ (1.92)
Diluted $ 0.45 $ 1.58 $ (1.92)