Share Based Awards - Shares available and options activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares Available for Issuance, Beginning Balance	1,301,881
Number of Shares Available for Issuance, Authorized	5,636,269
Shares withheld for net settlement of equity awards (in shares)	738,233
Number of Shares Available for Issuance, Ending Balance	4,075,082	1,301,881
Options Activity Rollforward
Options outstanding, Beginning Balance	2,898,977
Options exercised	(29,797)
Options cancelled	(71,058)
Options outstanding, Ending Balance	2,798,122	2,898,977
Vested and exercisable- end of the period	2,432,496
Vested and expected to vest - end of the period	2,739,242
Options Activity, Weighted Average Exercise Price Rollforward
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 5.17
Options Outstanding, Weighted Average Exercise Price Exercised	3.93
Options Outstanding, Weighted Average Exercise Price Cancelled	5.41
Options Outstanding, Weighted-Average Exercise Price, Ending Balance	5.18	$ 5.17
Options Outstanding, Weighted-Average Exercise Price, Vested and exercisable	5.28
Options Outstanding, Weighted-Average Exercise Price, Vested and expected to vest	$ 5.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options Outstanding, Weighted-Average Remaining Contractual Term (Years)	4 years 6 months	4 years 10 months 21 days
Options Outstanding, Weighted-Average Remaining Contractual Term Vested and exercisable (Years)	3 years 11 months 5 days
Options Outstanding, Weighted-Average Remaining Contractual Term Vested and expected to vest (Years)	4 years 5 months 1 day
Options Outstanding, Aggregate Intrinsic Value	$ 472	$ 1,556
Options Outstanding, Vested and exercisable, Aggregate Intrinsic Value	468
Options Outstanding, Vested and expected to vest, Aggregate Intrinsic Value	$ 472
Shares under Bonus Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued	(1,730,682)
Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares cancelled or forfeited	71,058
Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued	(1,470,300)
Shares cancelled or forfeited	533,623
Performance Stock Units (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued	(1,005,000)

Number of shares that have been withheld for net settlement of equity awards during the period.

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Number of additional shares authorized for issuance 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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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.

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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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Number of fully vested and expected to vest exercisable options that may 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 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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Other than shares newly issued, the number of additional shares issued (for example, a stock split) or canceled (for example, to correct a share issuance), during the period under the plan.

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Number of shares issued under share-based payment arrangement.

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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 that were terminated.

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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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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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 remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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 share options (or share units) exercised during the current period.

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