Stock-Based Compensation - Performance-based and Market-based Awards (Details) - Market based options	1 Months Ended
	Aug. 31, 2018 day $ / shares shares	Dec. 31, 2017 day $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, share price (in dollars per share) | $ / shares	$ 15.00	$ 15.00
Threshold trading days | day	20	20
Threshold consecutive trading days | day	30	30
Fully vest on January 1, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	397,693	642,307
Stock options granted, exercise price (in dollars per share) | $ / shares	$ 7.50	$ 7.50