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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) customer	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of customers | customer			2
Percentage of revenue			10.00%
Percentage of accounts receivable	10.00%		10.00%
Sales returns coverage period			30 days
Unbilled accounts receivable	$ 4.6		$ 4.6		$ 5.1
Deferred revenue recognized	$ 2.0	$ 2.0	$ 2.6	$ 1.9
Amortization period for incentive compensation costs			1 year
Distributor A
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	17.00%	17.00%	16.00%	15.00%
Percentage of accounts receivable	20.00%		20.00%		19.00%
Distributor B
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue	13.00%	15.00%	12.00%	14.00%
Percentage of accounts receivable	12.00%		12.00%		15.00%

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