v3.21.1

Stock incentive plans - Stock option awards (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
	Dec. 31, 2020	Mar. 31, 2021
Number of Options
Outstanding at beginning of period (in shares)		109
Exercised (in shares)		(13)
Outstanding and exercisable at end of period (in shares)	109	96
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)		$ 7.75
Exercised (in dollars per share)		9.64
Outstanding and exercisable at end of period (in dollars per share)	$ 7.75	$ 7.48
Weighted-Average Remaining Contract Life (years)
Outstanding and exercisable at end of period	1 year 9 months 18 days	1 year 8 months 12 days
Aggregate Intrinsic Value
Outstanding and exercisable at end of period	$ 559	$ 630

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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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