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Stock-Based Compensation - Stock Option Activity - Narratives (Details) - On the settlement of employee stock purchase plan shares - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock-Based Compensation
Granted (shares)	0	0	0
Granted in period, non-cash (shares)	219,000
Exercised, non-csh ( usd per share)	$ 6.25
Intrinsic value of options exercised during the period	$ 800,000	$ 300,000	$ 0
Maximum
Stock-Based Compensation
Expiration period	7 years
First anniversary vesting
Stock-Based Compensation
Vesting percentage	33.33%
Second anniversary vesting
Stock-Based Compensation
Vesting percentage	33.33%
Third anniversary vesting
Stock-Based Compensation
Vesting percentage	33.33%
Vesting period	3 years

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Non-cash

+ References

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Percentage of vesting of share-based compensation awards.

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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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