| Schedule of Segment Information | 
 The following table summarizes certain information regarding segments of the Company's operations: 
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Three Months Ended September 30, | 
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Nine Months Ended September 30, | 
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| (in thousands) | 
2020 | 
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2019 | 
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2020 | 
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2019 | 
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| Net sales | 
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| Metals Segment | 
$ | 
47,079  | 
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$ | 
60,121  | 
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$ | 
159,761  | 
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$ | 
195,728  | 
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| Specialty Chemicals Segment | 
12,187  | 
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13,519  | 
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40,338  | 
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41,494  | 
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$ | 
59,266  | 
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$ | 
73,640  | 
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$ | 
200,099  | 
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$ | 
237,222  | 
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| Operating (loss) income | 
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| Metals Segment | 
$ | 
(11,563) | 
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$ | 
450  | 
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$ | 
(19,784) | 
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$ | 
3,125  | 
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| Specialty Chemicals Segment | 
1,061  | 
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846  | 
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3,508  | 
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2,387  | 
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| Unallocated corporate expenses | 
1,526  | 
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2,369  | 
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5,132  | 
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6,622  | 
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| Acquisition related costs and other | 
656  | 
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90  | 
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803  | 
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438  | 
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Proxy contest costs  | 
207  | 
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—  | 
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3,105  | 
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—  | 
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Earn-out adjustments  | 
(146) | 
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(1,242) | 
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(969) | 
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(1,643) | 
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| Gain on lease modification | 
(171) | 
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—  | 
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(171) | 
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—  | 
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| Operating (loss) income | 
(12,574) | 
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79  | 
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(24,176) | 
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95  | 
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| Interest expense | 
452  | 
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944  | 
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1,703  | 
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2,977  | 
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| Change in fair value of interest rate swap | 
(16) | 
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21  | 
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65  | 
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145  | 
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| Other (income) expense, net | 
59  | 
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180  | 
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(1,244) | 
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(224) | 
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| Loss before income taxes | 
$ | 
(13,069) | 
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$ | 
(1,066) | 
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$ | 
(24,700) | 
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$ | 
(2,803) | 
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As of | 
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| (in thousands) | 
September 30, 2020 | 
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December 31, 2019 | 
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| Identifiable assets | 
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| Metals Segment | 
$ | 
157,974  | 
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$ | 
186,758  | 
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| Specialty Chemicals Segment | 
25,004  | 
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25,428  | 
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| Corporate | 
41,737  | 
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45,011  | 
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$ | 
224,715  | 
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$ | 
257,197  | 
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