Income taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax provision at federal statutory rate (21%)	$ (28,642)	$ (76,385)
Interest on convertible securities	6,537	3,505
Interest on convertible securities discount	4,423	3,257
Debt issuance cost related to convertible securities	0	76
Derivative liability related to convertible securities	(19,688)	29,098
Warrant expense	16,823	596
Meals and entertainment	13	210
Health insurance industry fee	2,715	0
Other, net	(766)	0
Valuation allowance	18,585	39,643
Provision for income taxes	$ 0	$ 0

Effective Income Tax Rate Reconciliation, Debt Issuance Cost, Amount

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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