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Selected Quarterly Financial Data (Unaudited) - Effect of Restatement on Consolidated Statements of Operations (Details) - USD ($)
$ / shares in Units, 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
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                
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
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
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)
Other expense, 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
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
Previously Reported                                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                
Net sales               $ 61,814             $ 389,446 $ 347,995
Cost of sales               57,758             326,612 280,950
Gross profit               4,056             62,834 67,045
Operating expenses:                                
Research, development and engineering expenses               5,250             21,681 16,900
Selling, general and administrative expenses               6,058             27,376 23,088
Asset impairment charges               0             0 0
Amortization of intangible assets               1,429             4,582 1,013
Total operating expenses               12,737             53,639 41,001
Operating (loss) income               (8,681)             9,195 26,044
Other expense (income):                                
Interest expense               1,421             4,327 1,331
Gain from change in fair value of warrants               (1,256)             (9,299) (6,169)
Other expense, net               85             229 183
Total other expense (income)               250             (4,695) (8,495)
(Loss) income before income taxes               (8,931)             13,890 34,539
Income tax expense (benefit)               (3,680)             (388) 10,813
Net (loss) income               $ (5,251)             $ 14,278 $ 23,726
Weighted-average common shares outstanding:                                
Basic (in shares)               10,819             10,808 10,707
Diluted (in shares)               10,819             11,074 11,132
(Loss) earnings per common share:                                
Basic (in dollars per share)               $ (0.49)             $ 1.32 $ 2.22
Diluted (in dollars per share)               $ (0.49)             $ 0.45 $ 2.13
Restatement Adjustments and Reclassifications                                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                
Net sales               $ 14,656             $ (27,059) $ (415)
Cost of sales               12,069             (15,464) 2,590
Gross profit               2,587             (11,595) (3,005)
Operating expenses:                                
Research, development and engineering expenses               (346)             1,893 2,405
Selling, general and administrative expenses               347             1,461 54
Asset impairment charges               345             11,686 310
Amortization of intangible assets               (1)             0 0
Total operating expenses               345             15,017 (1,071)
Operating (loss) income               2,242             (26,612) (1,934)
Other expense (income):                                
Interest expense               17             (7) 11
Gain from change in fair value of warrants               0             (1) (1)
Other expense, net               (26)             (85) (466)
Total other expense (income)               (9)             (129) 3,384
(Loss) income before income taxes               2,251             (26,483) (5,318)
Income tax expense (benefit)               323             (9,314) (3,069)
Net (loss) income               $ 1,928             $ (17,169) $ (2,249)
Weighted-average common shares outstanding:                                
Basic (in shares)               0             0 (2)
Diluted (in shares)               0             (83) (1)
(Loss) earnings per common share:                                
Basic (in dollars per share)               $ 0.07             $ (1.59) $ (0.21)
Diluted (in dollars per share)               $ 0.07             $ (1.56) $ (0.75)