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Share-based Compensation - Summary of Outstanding RSUs (Details) - RSUs outstanding - $ / shares
12 Months Ended
Mar. 01, 2018
Oct. 02, 2017
May 01, 2017
Dec. 31, 2019
Dec. 31, 2018
Summary of outstanding equity instruments and activity          
Outstanding at beginning of year (in equity instruments)       75,314 85,000
Granted (in equity instruments) 93,750 6,250 78,750   93,750
Vested (in equity instruments)       (21,251) (33,748)
Expired, forfeited or cancelled (in equity instruments)         (69,688)
Outstanding at end of period (in equity instruments)       54,063 75,314
Summary of weighted-average fair value          
Outstanding at beginning of year (in dollars per equity instrument)       $ 7.93 $ 7.15
Granted (in dollars per equity instrument)         8.30
Vested (in dollars per equity instrument)       7.86 7.34
Expired, forfeited or cancelled (in dollars per equity instrument)         7.77
Outstanding at end of period (in dollars per equity instrument)       $ 7.96 $ 7.93