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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]                                
Net sales $ 131,476 $ 99,953 $ 100,922 $ 84,265 $ 98,280 $ 78,944 $ 85,771 $ 76,470         $ 416,616 $ 339,465 $ 362,387 $ 347,580
Cost of sales 115,981 86,702 88,443 74,497 86,376 72,820 81,253 69,827         365,623 310,276 311,148 283,540
Gross profit 15,495 13,251 12,479 9,768 11,904 6,124 4,518 6,643         50,993 29,189 51,239 64,040
Operating expenses:                                
Research, development and engineering expenses 6,459 5,687 3,848 3,950 4,742 4,498 4,817 4,904         19,944 18,961 23,574 19,305
Selling, general and administrative expenses 11,297 12,062 10,688 10,209 8,563 6,855 6,699 6,405         44,256 28,522 28,837 23,142
Asset impairment charges 1 0 0 0 167 38 1,064 345         1 1,614 11,686 310
Amortization of intangible assets 1,210 1,210 1,209 1,209 1,430 1,429 1,429 1,428         4,838 5,716 4,582 1,013
Change in fair value of contingent consideration         0 0 (283) 0         0 (283) (23) (3,840)
Total operating expenses 18,967 18,959 15,745 15,368 14,902 12,820 13,726 13,082         69,039 54,530 68,656 39,930
Operating (loss) income (3,472) (5,708) (3,266) (5,600) (2,998) (6,696) (9,208) (6,439)         (18,046) (25,341) (17,417) 24,110
Other expense (income):                                
Interest expense 1,703 1,654 1,404 6,080 4,402 3,726 1,649 1,438         10,841 11,215 4,320 1,342
Loss (gain) from change in fair value of warrants 1,500 1,700 800 0 0 0 (157) (1,256)         4,000 (1,413) (9,300) (6,170)
Loss on debt extinguishment and modifications 0 0 0 11,921 332 25 0 0         11,921 357 12 0
Other expense (income), net (225) (9) 2,142 453 146 62 92 59         2,361 359 144 (283)
Total other expense (income) 2,978 3,345 4,346 18,454 4,880 3,813 1,584 241         29,123 10,518 (4,824) (5,111)
(Loss) income before income taxes (6,450) (9,053) (7,612) (24,054) (7,878) (10,509) (10,792) (6,680)         (47,169) (35,859) (12,593) 29,221
Income tax expense (benefit) (320) 149 135 479 (1,238) (1,792) 18,000 (3,357)         443 11,613 (9,702) 7,744
Net (loss) income (6,130) (9,202) (7,747) (24,533) $ (6,640) $ (8,717) $ (28,792) $ (3,323) $ (32,280) $ (32,115) $ (41,482) $ (40,832) (47,612) (47,472) (2,891) 21,477
Deemed dividend on Series B preferred stock (31,067) (3,603) (3,190) 0                 (37,860) 0 0 0
Net (loss) income available to common stockholders $ (37,197) $ (12,805) $ (10,937) $ (24,533)                 $ (85,472) $ (47,472) $ (2,891) $ 21,477
Weighted-average common shares outstanding:                                
Basic (in shares)               10,819         13,787 10,931 10,808 10,705
Diluted (in shares)               10,819         13,787 10,931 10,991 11,131
(Loss) earnings per common share:                                
Basic (in dollars per share)               $ (0.42)         $ (6.20) $ (4.34) $ (0.27) $ 2.01
Diluted (in dollars per share)               $ (0.42)         $ (6.20) $ (4.47) $ (1.11) $ 1.38