Organization and Basis of Presentation - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Basis Of Presentation [Line Items]
Common Stock, par value	$ 0.001	$ 0.001	$ 0.001
Sales return maximum duration		18 months
Offered period for sales return prior to expiration		6 months
Offered period for sales return subsequent to expiration		12 months
Discount for prompt payment	2.00%	2.00%
Inventory write down	$ 200,000	$ 400,000
Inventory valuation adjustments				$ 0
Bunavail [Member]
Basis Of Presentation [Line Items]
Deferred revenue related to sales	1,200,000	1,200,000	$ 800,000
Deferred cost of sales	$ 1,100,000	$ 1,100,000	$ 700,000
Minimum [Member]
Basis Of Presentation [Line Items]
Period of payments from customers		30 days
Maximum [Member]
Basis Of Presentation [Line Items]
Period of payments from customers		37 days