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Income Taxes - Uncertain Tax Positions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in Unrecognized Tax Benefits [Roll Forward]    
Balance, beginning of period $ 1,061 $ 0
Increases related to acquisition of Nutrisystem   1,006
Increases related to current year tax positions   8
Increases related to prior year tax positions 84 66
Decreases due to lapse of statute of limitations (20) (19)
Balance, end of period 1,100 $ 1,061
Decreases related to Nutrisystem divestiture $ (1,125)