Stock Based Compensation - Stock Option Activity Rollforward (Details) - Employee Stock Option - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Options outstanding
Balance, beginning of period	1,064,527	821,864	251,237
Granted	225,815	242,663	570,627
Balance, end of period	1,290,342	1,064,527	821,864	251,237
Weighted average exercise price (in dollars per stock option)
Balance, beginning of period	$ 6.24	$ 6.36	$ 5.69
Granted	6.26	5.85	6.65
Balance, end of period	6.24	6.24	6.36	$ 5.69
Weighted average grant date value (in dollars per stock option)
Balance, beginning of period	2.61	2.82	2.62
Granted	1.69	1.88	2.91
Balance, end of period	$ 2.45	$ 2.61	$ 2.82	$ 2.62
Options Exercisable
Balance, beginning of period	0	0	0
Granted	0	0	0
Balance, end of period	0	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term at December 31, 2019 (in years)	7 years 6 months
Book Value Target, Amount Per Share	$ 10.79	$ 9.97	$ 10.14	$ 8.96
Stock Options - first vesting tranche, third anniversary
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.33%
Stock Options - second vesting tranche, fourth anniversary
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.33%
Stock Options - third vesting tranche, fifth anniversary
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.33%

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Share-based Compensation Arrangement By Share-based Payment Award, Options, Exercisable, Grants In Period, Number

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Share-based Compensation Arrangements by Share-based Payment Award, Options, Book Value Target, Amount Per Share

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average grant-date fair value of non-vested options outstanding.

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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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