Stock-based Compensation - Schedule of Restricted Stock Activity (Details) - Restricted stock	12 Months Ended
	Dec. 31, 2017 $ / shares shares
NUMBER OF SH ARES
RSAs outstanding, beginning (in shares) | shares	164,194
Granted, number of shares (in shares) | shares	344,512
Vested (in shares) | shares	(59,091)
Cancelled (in shares) | shares	(2,566)
RSAs outstanding, ending (in shares) | shares	447,049
WEIGHTED AVERAGE FAIR VALUE PER SHARE
RSAs outstanding, weighted average exercise price, beginning (in dollars per share) | $ / shares	$ 19.87
Granted, weighted average exercise price (in dollars per share) | $ / shares	48.03
Vested, Weighted average exercise price (in dollars per share) | $ / shares	22.57
Cancelled, weighted average exercise price (in dollars per share) | $ / shares	43.90
RSAs outstanding, weighted average exercise price, ending (in dollars per share) | $ / shares	$ 41.08