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Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock option activity
Options outstanding (in shares)	232,870	202,215	240,695
Options assumed in acquisition (in shares)		313,360
Options exercised (in shares)	(74,030)	(281,125)	(35,280)
Options forfeited (in shares)	(4,400)	(1,580)	(3,200)
Options outstanding (in shares)	154,440	232,870	202,215
Stock option activity, weighted average exercise price
Options Outstanding, weighted average exercise price (in dollars per share)	$ 9.13	$ 6.87	$ 6.83
Options assumed in acquisition (in dollars per share)		11.79
Options exercised, weighted average exercise price (in dollars per share)	9.97	10.47	6.55
Options canceled, weighted average exercise price (in dollars per share)	10.85	8.11	8.77
Options Outstanding, weighted average exercise price (in dollars per share)	$ 8.68	$ 9.13	$ 6.87
Options vested or expected to vest (in shares)	154,440
Options exercisable (in shares)	154,440
Options vested or expected to vest, weighted average exercise price (in dollars per share)	$ 8.68
Options exercisable, weighted average exercise price (in dollars per share)	$ 8.68
Options outstanding, weighted average remaining contractual term	2 years 9 months 21 days	2 years 10 months 13 days	3 years 3 months 5 days
Options vested or expected to vest, weighted average remaining contractual term	2 years 9 months 21 days
Options exercisable, weighted average remaining contractual term	2 years 9 months 21 days
Options outstanding, aggregate intrinsic value	$ 1,554	$ 2,574	$ 2,647
Options vested or expected to vest, aggregate intrinsic value	1,554
Options exercisable, aggregate intrinsic value	$ 1,554

X

- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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