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Employee benefit plans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense		$ 37,185,000	$ 41,854,000
ESPP stock issued during period (shares)	1,000,000	958,000	981,000
ESPP weighted average purchase price of shares purchased (usd per share)	$ 3.42	$ 4.13	$ 4.78
Weighted average price of shares granted (usd per share)	$ 4.59	$ 5.70	$ 5.83
Unearned stock-based compensation, expected recognition period	2 years 2 months 12 days
Share-based Payment Arrangement, Expense, Tax Benefit	$ 0	$ 0	$ 0
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	100.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	100.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 1,400,000	$ 4,000,000.0	$ 4,300,000
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)	8,759,000
Weighted average price of shares granted (usd per share)	$ 4.59
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)	1,231,000
Weighted average price of shares granted (usd per share)	$ 4.05	$ 7.51	$ 5.76
Employee Stock Purchase Plan Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase Price of Common Stock, Percent	85.00%
Stock Options, ESPP and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned stock-based compensation costs	$ 47,700,000
2014 Equity Incentive Plans [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration Period	10 years
2014 Equity Incentive Plans [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
2014 Equity Incentive Plans [Member] | Minimum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	1 year
2014 Equity Incentive Plans [Member] | Minimum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	2 years
2014 Equity Incentive Plans [Member] | Maximum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	4 years
2014 Equity Incentive Plans [Member] | Maximum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	4 years

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