Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2021	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Inventory reserves	$ 6,500,000	$ 5,000,000
Impairment of intangible assets, finite lived	0		$ 0
Warranty reserve	1,200,000	1,000,000
Advertising costs	4,800,000	3,400,000	5,700,000
Guarantees and indemnifications liabilities	$ 0	0
Product warranty accrual period	1 year
Standard warranty period	12 months
Capitalized Computer Software, Gross	$ 3,200,000
Stockholders' Equity Attributable to Parent	(176,962,000)	(306,948,000)	(104,151,000)		$ (36,869,000)
Accumulated deficit	(649,753,000)	(542,030,000)
Additional Paid-in Capital
Significant Accounting Policies [Line Items]
Stockholders' Equity Attributable to Parent	(827,028,000)	(848,891,000)	$ (535,954,000)		$ (428,162,000)
Cumulative Effect, Period of Adoption, Adjustment
Significant Accounting Policies [Line Items]
Stockholders' Equity Attributable to Parent		51,012,000
Accumulated deficit				$ 7,500,000
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-in Capital
Significant Accounting Policies [Line Items]
Stockholders' Equity Attributable to Parent		$ 58,543,000		$ 58,500,000
Software Development
Significant Accounting Policies [Line Items]
Capitalized Computer Software, Gross	$ 4,000,000
Convertible Senior Notes Due 2025 | Senior Notes
Significant Accounting Policies [Line Items]
Debt stated rate	2.625%
Manufacturing equipment
Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	5 years
Prototype Systems
Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	2 years
Computer equipment
Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	3 years
Furniture and fixtures
Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	5 years
Minimum
Significant Accounting Policies [Line Items]
Extended warranty period	12 months
Maximum
Significant Accounting Policies [Line Items]
Extended warranty period	36 months
Sales Revenue, Net | Customer Concentration Risk | Lam Research Corporation
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		4.00%	13.00%
Veracyte
Significant Accounting Policies [Line Items]
Impairment of long-lived assets		$ 1,100,000