Stock-based Compensation - Stock Option and Restricted Share Activity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Stock options
Stock-based compensation expense
Shares available for future issuance	510,261
Shares
Outstanding at the beginning of the period (in shares)	784,011
Options granted (in shares)	141,000
Outstanding at the end of the period (in shares)	925,011
Exercisable at the end of the period (in shares)	149,882
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at the beginning of the period (in dollars per share)	$ 10.70
Options granted (in dollars per share)	15.80
Outstanding at the end of the period (in dollars per share)	11.48
Exercisable at the end of the period (in dollars per share)	$ 12.78
Additional disclosures
Total cash received from stock option exercises	$ 0	$ 0
Weighted-average grant date fair value of options (in dollars per share)	$ 12.69
Stock options | Maximum
Stock-based compensation expense
Expiration period	10 years
Restricted stock
Shares
Unvested restricted common stock	157,262		157,262
Weighted average grant date fair value
Weighted average grant date fair value	$ 10.06		$ 10.06