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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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The period of Go-Shop in a merger agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The maximum amount that the entity is liable to pay the other party of merger agreement upon termination of agreement.

+ References

No definition available.

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- Definition

The amount the of termination fee payable if other party fails to consummate the Merger after the applicable closing conditions are met.

+ References

No definition available.

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- Definition

Price per share of the entity's stock in a merger agreement.

+ References

No definition available.

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Period of receipt of acquisition proposal after termination of merger agreement which requires the entity to pay termination fee in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Minimum percentage of acquisition of entity's stock that is not withdrawn prior to merger agreement termination which triggers termination liability to the other party in the merger agreement.

+ References

No definition available.

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- Definition

The amount of termination fee of the merger agreement during the Go-Shop Period other than to enter into an agreement for a Superior Proposal.

+ References

No definition available.

+ Details

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- Definition

The amount of termination fee of the merger agreement during the Go-Shop Period to enter into an agreement for a Superior Proposal.

+ References

No definition available.

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Subsequent events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Feb. 26, 2021	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Performance-based restricted stock unit awards
Subsequent events
Granted (in shares)			36,000
Vesting period			3 years	3 years
Subsequent events
Subsequent events
Merger price per share (USD per share)	$ 14.00
Go shop period	25 days
Termination fee payable to enter into Superior proposal	$ 13,100
Termination fee payable in other circumstances	$ 19,600
Minimum percentage acquisition proposal not withdrawn prior to merger agreement termination (as a percent)	50.10%
Period after termination of merger agreement within which receipt of acquisition proposal triggers termination fee	1 year
Maximum expense payable to other party	$ 2,500
Parent termination fee payable	$ 32,700
Subsequent events \| Executive members \| Service based-restricted stock unit awards
Subsequent events
Granted (in shares)		295,000
Vesting period		3 years
Subsequent events \| Executive members \| Performance-based restricted stock unit awards
Subsequent events
Granted (in shares)		295,000
Subsequent events \| Non-executive personnel \| Service based-restricted stock unit awards
Subsequent events
Granted (in shares)		336,000
Vesting period		3 years