Stock-Based Compensation - Summary of Performance Restricted Stock Awards Activity (Details) - Performance Restricted Stock $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Shares
Non-vested restricted stock, beginning balance (in shares) | shares	0
Granted (in shares) | shares	303,495
Vested (in shares) | shares	0
Cancelled (in shares) | shares	(12,323)
Non-vested restricted stock, ending balance (in shares) | shares	291,172
Weighted- Average Grant Date Fair Value Per Share
Weighted average grant date fair value per share, non-vested restricted stock, beginning balance (in dollars per share) | $ / shares	$ 0.00
Weighted average grant date fair value per share, granted (target) (in dollars per share) | $ / shares	16.69
Weighted average grant date fair value per share, vested (in dollars per share) | $ / shares	0.00
Weighted average grant date fair value per share, forfeited (in dollars per share) | $ / shares	16.62
Weighted average grant date fair value per share, non-vested restricted stock, ending balance (in dollars per share) | $ / shares	$ 16.70
Unrecognized compensation expense | $	$ 3.9
Weighted-average remaining period for recognition of unrecognized compensation costs (in years)	2 years 1 month 6 days