Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Number of operating segment \| Segment	1
Unrealised gains losses on money market instruments	$ 0	$ 0
Allowance For doubtful debts	0	300,000
Impairment of long lived assets	$ 0	0
Product warranty	The Company generally provides a one-year warranty on its instruments.
Foreign currency transaction losses	$ 100,000	(300,000)	$ 100,000
Advertising Costs	1,500,000	$ 700,000	$ 200,000
Restricted Cash For Letter Of Credit [Member]
Restricted cash and cash equivalents	5,000,000
Restricted Cash For Bonds [Member]
Restricted cash and cash equivalents	45,200,000
Restricted Cash For Esxrow [Member]
Restricted cash and cash equivalents	$ 2,100,000
Maximum [Member]
Percentage of tax benefit recognised	50.00%
Recognition of right to use assets	$ 43,000,000
Lease Liabilities	59,000,000
Minimum [Member]
Recognition of right to use assets	33,000,000
Lease Liabilities	$ 49,000,000
Revenue [Member]
Concentration risk percentage	10.00%	10.00%	10.00%
Accounts receivable [Member]
Concentration risk percentage	10.00%	10.00%
Fair value, inputs, level 1 [Member] \| Money market funds [Member]
Fair value of money market instruments	$ 398,500,000	$ 44,500,000
Unrealised gains losses on money market instruments	$ 0

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