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Equity Compensation Plans - Summary of stock option activity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Summary Of Stock Option Activity [Abstract]
Intrinsic value of options exercised	$ 27
Cash received from options exercised		$ 32
Stock based compensation		$ 1,905	$ 1,641
2014 Plan
Summary Of Stock Option Activity [Abstract]
Number of shares authorized	600,000	600,000
Number of shares issuable	433,894	433,894

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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