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Equity Awards and Instruments - Summary of options outstanding and exercisable by exercise price (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Aug. 28, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices, Lower limit	$ 0.01
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options Outstanding		18,691,667
Exercisable		7,573,830
Cash proceeds from exercise of stock options		$ 3,612	$ 2,179
Exercise Prices $3.50 - $4.00 | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices, Lower limit		$ 3.50
Exercise Prices, Upper limit		$ 4.00
Number of Options Outstanding		1,978,256
Weighted Remaining Contractual Life (in years)		4 months 21 days
Exercisable		1,978,256
Exercise Prices 4.01 - 6.00 | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices, Lower limit		$ 4.01
Exercise Prices, Upper limit		$ 6.00
Number of Options Outstanding		7,450,203
Weighted Remaining Contractual Life (in years)		1 year 9 months 11 days
Exercisable		4,469,866
Exercise Prices $6.01 - $7.24 | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Prices, Lower limit		$ 6.01
Exercise Prices, Upper limit		$ 7.24
Number of Options Outstanding		9,263,208
Weighted Remaining Contractual Life (in years)		3 years 9 months 26 days
Exercisable		1,125,708

X

- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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