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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Changes in Fair Value of Company's Earn-Out Liability
The following table presents a summary of changes in fair value of the Company's Level 3 earn-out liabilities measured on a recurring basis for the nine months ended September 30, 2021:
(in thousands)MUSA-StainlessMUSA-GalvanizedAmerican StainlessTotal
Balance December 31, 2020$375 $941 $2,405 $3,721 
Earn-out payments during the period
(385)(780)(1,737)(2,902)
Changes in fair value during the period
10 949 471 1,430 
Balance September 30, 2021$— $1,110 $1,139 $2,249 
Schedule of Level 3 Assets and the Valuation Techniques Used to Measure Fair Value
The following table summarizes the significant unobservable inputs in the fair value measurement of our contingent consideration (earn-out) liabilities as of September 30, 2021:
InstrumentFair Value
September 30, 2021
Principal Valuation TechniqueSignificant Unobservable InputsRangeWeighted
Average
Contingent consideration (earn-out) liabilities$2,249Probability Weighted Expected ReturnDiscount rate-5%
Timing of estimated payouts2021 - 2022-
Future revenue projections
$6.4M - $9.5M
$8.3M