Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents					$ 96,791				$ 189,702	$ 96,791
Net loss	$ (2,947)	$ (2,316)	$ (81,687)	$ (184,123)	(219,148)	$ (36,351)	$ (36,301)	$ (29,369)	(271,073)	(321,169)	$ (67,723)
Net cash used in operating activities									(129,351)	(258,065)	(46,248)
Net cash inflows									92,911	(390,464)	$ 484,932
Working capital					$ 166,600				165,738	$ 166,600
Increase in cash due to working capital adjustments									(92,911)
Reduction in payables									32,232
Increase in warrant liability									$ 120,647
Antidilutive securities excluded from computation of earnings per share									28,784,308	10,532,988	7,902,263
Advertising costs									$ 2,384	$ 3,563	$ 618
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents maturity period									3 months
Property, plant and equipment useful life									15 years
Maximum [Member] | Building [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment useful life									25 years
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment useful life									3 years
Minimum [Member] | Building [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment useful life									20 years
Convertible Senior Notes Due 2023 [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt instrument interest rate									5.00%