Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Summary of Changes in Fair Value of Company's Earn-Out Liability (Details)

v3.19.2
Fair Value of Financial Instruments - Summary of Changes in Fair Value of Company's Earn-Out Liability (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Earn-out payments during the period $ 1,345,539 $ 977,603
Level 3 Inputs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at December 31, 2018 7,609,384  
Fair value of the earn-out liability associated with the American Stainless acquisition 6,366,324  
Earn-out payments during the period (1,781,860)  
Changes in fair value during the period (401,285)  
Balance at June 30, 2019 11,792,563  
MUSA-Stainless | Level 3 Inputs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at December 31, 2018 4,251,584  
Fair value of the earn-out liability associated with the American Stainless acquisition 0 $ 2,461,658
Earn-out payments during the period (784,852)  
Changes in fair value during the period (192,065)  
Balance at June 30, 2019 3,274,667  
MUSA-Galvanized | Level 3 Inputs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
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 (378,649)  
Changes in fair value during the period (473,000)  
Balance at June 30, 2019 2,506,151  
ASTI | Level 3 Inputs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at December 31, 2018 0  
Fair value of the earn-out liability associated with the American Stainless acquisition 6,366,324  
Earn-out payments during the period (618,359)  
Changes in fair value during the period 263,780  
Balance at June 30, 2019 $ 6,011,745