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Stock-based Compensation - Stock Option and Restricted Share Activity (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Stock options
Stock-based compensation expense
Shares available for future issuance	1,458,561
Shares
Outstanding at the beginning of the period (in shares)	784,011
Options granted (in shares)	192,700
Outstanding at the end of the period (in shares)	976,711
Exercisable at the end of the period (in shares)	153,088
Weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 10.70
Options granted (in dollars per share)	15.96
Outstanding at the end of the period (in dollars per share)	11.74
Exercisable at the end of the period (in dollars per share)	$ 13.06
Additional disclosures
Total cash received from stock option exercises	$ 0	$ 0
Weighted-average grant date fair value of options (in dollars per share)	$ 12.68
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

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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