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)

v3.19.3
Fair Value of Financial Instruments - Summary of Changes in Fair Value of Company's Earn-Out Liability (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Earn-out payments during the period $ 2,496,571 $ 1,618,767
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 (2,944,121)  
Changes in fair value during the period (1,642,982)  
Balance at September 30, 2019 9,388,605  
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 $ 219,548
Earn-out payments during the period (1,186,666)  
Changes in fair value during the period (1,035,212)  
Balance at September 30, 2019 2,029,706  
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 (582,889)  
Changes in fair value during the period (894,288)  
Balance at September 30, 2019 1,880,623  
American Stainless | 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 (1,174,566)  
Changes in fair value during the period 286,518  
Balance at September 30, 2019 $ 5,478,276