Share-Based Compensation - Summary of Stock Option Awards Outstanding Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Shares Under Option
Outstanding at beginning of period	299
Granted	170
Outstanding at end of period	469	299
Vested and expected to vest at end of period	458
Exercisable at end of period	119
Weighted Average Exercise Price
Outstanding at beginning of period	$ 21.48
Granted	22.35
Outstanding at end of period	21.80	$ 21.48
Vested and expected to vest at end of period	21.78
Exercisable at end of period	$ 11.95
Weighted Average Remaining Contractual Term (years)
Outstanding at beginning of period	5 years 7 months 6 days	3 years 6 months
Granted	9 years 10 months 24 days
Vested and expected to vest at end of period	5 years 6 months
Exercisable at end of period	1 year 10 months 24 days
Aggregate Intrinsic Value
Outstanding at beginning of period	$ 1.4
Outstanding at end of period	0.9	$ 1.4
Vested and expected to vest at end of period	0.9
Exercisable at end of period	$ 0.9