Represents the percentage of the share-based compensation award that vests on the first anniversary date.

No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Face amount or stated value per share of common stock.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Date the equity-based award expires, in CCYY-MM-DD format.

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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

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

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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No definition available.

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Description of significant modifications (such as a change in expiration dating, vesting rights, or exercise prices) to an equity-based compensation plan, including the terms of the modifications.

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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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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Stock Options - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended		12 Months Ended
	Mar. 07, 2018	Jan. 30, 2018	May 01, 2016	Aug. 22, 2012	May 31, 2015	Dec. 31, 2011	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, grants in period, gross		2,800					2,800
Share-based compensation arrangement by share-based payment award, fair value assumptions, exercise Price		$ 2.37
Stock issued during period, shares, restricted stock award, net of forfeitures	2,000,000
Common Stock, Par or Stated Value Per Share	$ 0.001						$ 0.001	$ 0.001
Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price							$ 2.37
Share-based compensation arrangement by share-based payment award, expiration date		Dec. 31, 2018
Allocated Share-based Compensation Expense							$ 4,305	$ 979	$ 2,409
Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	60.00%
Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	40.00%
Share-based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	40.00%
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award, net of forfeitures					729,000
Share-based compensation arrangement by share-based payment award, options, grants in period, net of forfeitures					1,341,000
Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price					$ 4.98
Share-based compensation arrangement by share-based payment award, expiration date					Apr. 30, 2023
Share-based compensation arrangement by share-based payment award, plan modification, description and terms							the board of directors approved that an additional 30% of the Options to be vested on December 16, 2016, and restrictions of an additional 30% of the Restricted Shares were removed on December 16, 2016. On April 25, 2018, the board of directors approved that all remaining unvested Options and Restricted Shares that were granted on May 1, 2015 were fully vested on April 25, 2018.
2012 Plan \| Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage			20.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, percentage of outstanding Stock maximum							10.00%
Share-based compensation arrangement by share-based payment award, options, grants in period, gross						767,000
Share-based compensation arrangement by share-based payment award, fair value assumptions, exercise Price						$ 2.37
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value							$ 1,135	384	$ 1,567
Stock options \| 2003 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant									42,800
Share based compensation arrangements by share Based payment award options vesting rights percentage							10.00%
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value							$ 13	$ 861	$ 386
Stock options \| 2003 Plan \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period							10 years
Stock options \| 2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized				4,000,000
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options							$ 0
Employee service Share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition							50 months
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value							$ 413
Stock options \| 2012 Plan \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period				10 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Par or Stated Value Per Share					$ 0.001
Restricted Stock \| 2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options							$ 12,561