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Share-Based Compensation - Schedule of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs)
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Shares  
Unvested share awards outstanding, beginning of period (in shares) 335
Awards granted (in shares) 30
Awards released (in shares) (52)
Awards forfeited (in shares) 0
Unvested share awards outstanding, end of period (in shares) 313
Weighted Average Grant Date Fair Value  
Unvested share awards, Weighted Average Grant Date Fair Value, Beginning of Period (in dollars per share) | $ / shares $ 39.72
Awards granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 82.39
Awards released, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 42.15
Unvested share awards, Weighted Average Grant Date Fair Value, End of Period (in dollars per share) | $ / shares $ 43.45