v3.21.1

Stock incentive plans - Restricted stock unit awards (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Stock incentive plans
Shares of common stock issued resulting from vesting	92,000
RSUs
Stock incentive plans
Unvested RSU awards expense expected to be recognized | $	$ 17,639
Weighted average period over which unrecognized compensation expense is expected to be recognized	2 years 2 months 12 days
Number of Shares
Non-vested at beginning of period (in shares)	951,000
Granted (in shares)	893,000
Vested (in shares)	(134,000)
Canceled/forfeited (in shares)	(37,000)
Non-vested at end of period (in shares)	1,673,000
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 14.30
Granted (in dollars per share) | $ / shares	11.55
Vested (in dollars per share) | $ / shares	15.86
Canceled/forfeited (in dollars per share) | $ / shares	12.18
Non-vested at end of period (in dollars per share) | $ / shares	$ 12.75
Service-based restricted stock unit awards | Executive And Non Executive Member | Maximum
Stock incentive plans
Vesting period	3 years
Service-based restricted stock unit awards | Non-employee directors and existing members
Stock incentive plans
Vesting period	1 year
Service-based restricted stock unit awards | Non-employee directors and new members
Stock incentive plans
Vesting percentage when the individual completes 12 months of continuous service	33.30%
Vesting period	3 years
Performance-based restricted stock unit awards
Stock incentive plans
Vesting period	3 years
2019 and 2020 performance-based RSUs
Stock incentive plans
2019 and 2020 Revenue goals achieved (as a percent)	58.40%
2010 and 2020 EBITDA goals achieved (as a percent)	97.40%
Number of Shares
Granted (in shares)	107,000
Weighted Average Grant Date Fair Value
Granted (in dollars per share) | $ / shares	$ 11.54
2020 performance-based RSUs
Stock incentive plans
Number of awards excluded from granted and non-vested as the performance targets have not yet been defined	75,000
2021 performance-based RSUs
Stock incentive plans
Number of awards excluded from granted and non-vested as the performance targets have not yet been defined	177,000

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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The percentage of EBITDA metric achieved during the period for target number of equity instruments other than options under stock -based compensation arrangement.

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The number of non-vested equity-based payment instruments that exist but are excluded from granted and non-vested awards because the performance targets have not yet been defined as of the balance sheet date.

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