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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2020
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 2020 and 2019:
(in thousands)MUSA-StainlessMUSA-GalvanizedAmerican StainlessTotal
Balance December 31, 2018$4,252 $3,358 $— $7,610 
Fair value of the earn-out liability associated with the American Stainless (ASTI) acquisition— — 6,366 $6,366 
Earn-out payments during period
(1,634)(712)(1,729)$(4,075)
Changes in fair value during the period
(215)(864)332 $(747)
Balance December 31, 2019$2,403 $1,782 $4,969 $9,154 
Earn-out payments during period
(1,625)(611)(2,002)$(4,238)
Changes in fair value during the period
(403)(230)(562)$(1,195)
Balance December 31, 2020$375 $941 $2,405 $3,721 
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 December 31, 2020:
InstrumentFair Value
December 31, 2020
Principal Valuation TechniqueSignificant Unobservable InputsRangeWeighted
Average
Contingent consideration (earn-out) liabilities$3,721Probability Weighted Expected ReturnDiscount rate-5%
Timing of estimated payouts2021 - 2022-
Future revenue projections
$4.7M - 12.7M
$9.7M