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Other Financial Statement Information - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Concentration Risk [Line Items]
Transaction price allocated to remaining performance obligations	$ 4,600		$ 4,600
Contract liability	4,600		4,600		$ 4,100
Deferred revenue, current	3,432		3,432		$ 3,297
Contract with customer, liability, revenue recognized	$ 1,100		$ 2,100
Revenue | Geographic Concentration Risk | UNITED STATES
Concentration Risk [Line Items]
Percentage of revenue	45.00%	53.00%	50.00%	57.00%

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