Summary of Significant Accounting Policies and Recent Accounting Pronouncements - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended						9 Months Ended		12 Months Ended
	Jan. 02, 2021 USD ($)	Sep. 30, 2021 USD ($) $ / shares	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($) Segment $ / shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | Segment								1
Net loss		$ (48,144)	$ (81,405)	$ (167,250)	$ (196,499)	$ (150,820)	$ (17,492)	$ (296,799)	$ (364,811)
ASU 2020-06
Summary Of Significant Accounting Policies [Line Items]
Increase in convertible notes	$ 96,800
Decrease in accumulated deficit	(60,200)
Decrease in additional paid-in-capital	$ (157,000)
Interest expense reduced		5,600						16,600
Net loss		$ 5,600						$ 16,600
Increase in diluted earnings per share (in dollar per share) | $ / shares		$ 0.07						$ 0.21
Outside of U.S. [Member] | Product Revenues [Member] | Customer One [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage		45.00%			47.00%			47.00%	47.00%
Outside of U.S. [Member] | Product Revenues [Member] | Customer Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage		39.00%			38.00%			40.00%	39.00%
Outside of U.S. [Member] | Product Revenues [Member] | Customer Three [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage		11.00%			10.00%			10.00%	11.00%
Outside of U.S. [Member] | Accounts Receivable [Member] | Customer One [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage								44.00%		45.00%
Outside of U.S. [Member] | Accounts Receivable [Member] | Customer Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage								39.00%		41.00%
Outside of U.S. [Member] | Accounts Receivable [Member] | Customer Three [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage								10.00%		9.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable payment term								60 days
Minimum [Member] | Outside of U.S. [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable payment term								45 days
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable payment term								91 days
Maximum [Member] | Outside of U.S. [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable payment term								150 days