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Fair Value of Financial Instruments - Summary of Changes in Fair Value of Company's Earn-Out Liability (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Earn-out payments during the period | $ 190,473 | $ 680,941
Level 3 Inputs |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at December 31, 2018 | 7,609,384 |
Fair value of the earn-out liability associated with the American Stainless acquisition | 6,148,230 |
Earn-out payments during the period | (560,762) |
Changes in fair value during the period | 16,523 |
Balance at March 31, 2019 | 13,213,375 |
MUSA-Stainless | Level 3 Inputs |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at December 31, 2018 | 4,251,584 |
Fair value of the earn-out liability associated with the American Stainless acquisition | 0 | $ 154,060
Earn-out payments during the period | (370,289) |
Changes in fair value during the period | 343,710 |
Balance at March 31, 2019 | 4,225,005 |
MUSA-Galvanized | Level 3 Inputs |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at December 31, 2018 | 3,357,800 |
Fair value of the earn-out liability associated with the American Stainless acquisition | 0 |
Earn-out payments during the period | (190,473) |
Changes in fair value during the period | (392,958) |
Balance at March 31, 2019 | 2,774,369 |
ASTI | Level 3 Inputs |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at December 31, 2018 | 0 |
Fair value of the earn-out liability associated with the American Stainless acquisition | 6,148,230 |
Earn-out payments during the period | 0 |
Changes in fair value during the period | 65,771 |
Balance at March 31, 2019 | $ 6,214,001 |

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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Earn-Out Liability + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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