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Income taxes.

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Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2019	Jan. 01, 2019
Income Taxes [Line Items]
Income tax expense	$ 393,000	$ 2,547,000	$ (18,342,000)
Corporate income tax rate	21.00%	21.00%	34.00%
Property and equipment		$ 203,000
Change in net deferred tax assets before valuation allowance	$ 1,811,249,000	1,501,830,000
Net deferred tax liability	$ 417,000	516,000
Pre-Tax Act U.S. federal net operating loss carry-forwards beginning of expiration year	2031
Pre-Tax Act U.S. state net operating loss carry-forwards beginning of expiration year	2026
U.S. Federal research tax credits beginning of expiration year	2032
Deferred tax assets, valuation allowance	$ 1,811,666,000	1,502,346,000
Gross unrecognized tax benefits, including related interest and penalties	286,805,000	252,068,000
Net unrecognized tax benefits	286,605,000	251,808,000	$ 203,177,000
Amount of tax benefit when gross unrecognized tax benefits realized	$ 2,700,000
Petition review decision period	90 days
Other Liabilities
Income Taxes [Line Items]
Net unrecognized tax benefits	$ 1,500,000	$ 2,700,000
Convertible Notes
Income Taxes [Line Items]
Net deferred tax liability				$ 92,100,000
ASU 2016-12
Income Taxes [Line Items]
Deferred tax assets for operating lease liabilities					$ 90,900,000
Deferred tax liability operating lease right of use assets					69,000,000.0
Deferred tax assets accrued expenses					14,400,000
Property and equipment					7,500,000
Change in net deferred tax assets before valuation allowance					$ 0
Federal
Income Taxes [Line Items]
Corporate income tax rate	21.00%
Net operating loss carry-forwards	$ 4,000,000,000.0
Pre-Tax Act operating loss carry-forwards			$ 1,500,000,000
Post-Tax Act operating loss carry-forwards	$ 2,500,000,000
Pre-Tax Act operating loss carry-forwards period			20 years
Percentage of taxable income limitation	80.00%
Federal \| Research
Income Taxes [Line Items]
Accumulated research tax credits	$ 225,200,000
State
Income Taxes [Line Items]
Net operating loss carry-forwards	2,300,000,000
State \| Research
Income Taxes [Line Items]
Accumulated research tax credits	135,800,000
U.K.
Income Taxes [Line Items]
Net operating loss carry-forwards	$ 1,300,000,000