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Share-based Payments - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares, outstanding at beginning of period (in shares)	544,647	624,256
Number of shares, granted (in shares)	337,500
Number of shares, expired and canceled (in shares)	(38,701)	(78,786)
Number of shares, forfeited prior to vesting (in shares)		(823)
Number of shares, exercised (in shares)
Number of shares, outstanding at end of period (in shares)	843,446	544,647	624,256
Number of shares, vested and expected to vest at end of period (in shares)	843,446	544,647
Number of shares, vested at end of period (in shares)	505,946	527,181
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning of period (in dollars per share)	$ 9.01	$ 8.87
Weighted average exercise price, granted (in dollars per share)	2.50
Weighted average exercise price, expired and canceled (in dollars per share)	4.81	7.85
Weighted average exercise price, forfeited prior to vesting (in dollars per share)		11.97
Weighted average exercise price, exercised (in dollars per share)
Weighted average exercise price, end of period (in dollars per share)	6.60	9.01	$ 8.87
Weighted average exercise price, vested and expected to vest at end of period (in dollars per share)	6.60	9.01
Weighted average exercise price, vested at end of period (in dollars per share)	$ 9.33	$ 8.97
Weighted Average Remaining Contractual Term (Years)	4 years 10 months 28 days	4 years 11 months 5 days	5 years 3 months 11 days
Weighted average remaining contractual term, vested and expected to vest (Years)	4 years 10 months 28 days	4 years 11 months 5 days
Weighted average remaining contractual term, vested (Years)	4 years 2 months 16 days	4 years 10 months 6 days
Aggregate intrinsic value
Aggregate intrinsic value, vested and expected to vest
Aggregate intrinsic value, vested

X

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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Gross number of share options (or share units) granted during the 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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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 exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. 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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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 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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