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 3 Months Ended
Mar. 31, 2021
Text Block [Abstract]  
Discounted Cash Flow Analyses
The key assumptions used in the discounted cash flow analyses are as follows:
Revenue growth rates
  (14.1)% - 7.9%
Market revenue shares at maturity
  0.6% - 39.0%
Operating income margins at maturity
  26.5% - 35.4%
Discount rate
  9.5%