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Summary of Activity Related To Time-based Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs) (Details) - 2015 Plan [Member]
 6 Months Ended
Jun. 30, 2020
$ / shares
shares
RSUs [Member]  
Restricted Stock Units Outstanding  
Restricted Stock Units Outstanding, Beginning of year | shares 661,258
Restricted Stock Units Outstanding, Granted | shares 624,415
Restricted Stock Units Outstanding, Vested | shares (252,268)
Restricted Stock Units Outstanding, Cancelled | shares (27,557)
Restricted Stock Units Outstanding, End of year | shares 1,005,848
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares $ 16.44
Weighted Average Grant Date Fair Value, Granted | $ / shares 9.65
Weighted Average Grant Date Fair Value, Vested | $ / shares 17.06
Weighted Average Grant Date Fair Value, Cancelled | $ / shares 17.37
Weighted Average Grant Date Fair Value, End of year | $ / shares $ 12.04
Performance Stock Units (PSUs) [Member]  
Restricted Stock Units Outstanding  
Restricted Stock Units Outstanding, Beginning of year | shares 376,328 [1]
Restricted Stock Units Outstanding, Granted | shares 404,880 [1]
Restricted Stock Units Outstanding, Vested | shares (5,254) [1]
Restricted Stock Units Outstanding, Cancelled | shares (32,235) [1]
Restricted Stock Units Outstanding, End of year | shares 743,719 [1]
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Beginning of year | $ / shares $ 20.65
Weighted Average Grant Date Fair Value, Granted | $ / shares 8.86
Weighted Average Grant Date Fair Value, Vested | $ / shares 28.72
Weighted Average Grant Date Fair Value, Cancelled | $ / shares 28.72
Weighted Average Grant Date Fair Value, End of year | $ / shares $ 13.82
[1] The number of shares for 62,791 of the PSUs included in the outstanding balance at January 1, 2020 represents the actual number of PSUs granted to each recipient that are eligible to vest if the Company meets its performance goals for the applicable period. The number of shares for the remainder of the PSUs included in the outstanding balance at January 1, 2020 and for all of the PSUs granted in 2020 represents the “target” number of PSUs granted to each recipient eligible to vest if the Company meets its “target” performance goals for the applicable period. The actual number of PSUs eligible to vest for those PSUs will vary depending on whether or not the Company meets or exceeds the applicable threshold, target, or maximum performance goals for the PSUs, with 200% of the “target” number of PSUs eligible to vest at “maximum” performance levels.