Summary of Product Revenue Allowances and Reserve Categories (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Valuation Allowance [Line Items]
Beginning balance	$ 900	$ 982	$ 610
Provision	1,370	938	1,200
Payments or credits	(808)	(1,020)	(828)
Ending balance	1,462	900	982
Trade Allowances
Valuation Allowance [Line Items]
Beginning balance	52	43	18
Provision	195	176	126
Payments or credits	(192)	(167)	(101)
Ending balance	55	52	43
Rebates Chargebacks and Discounts
Valuation Allowance [Line Items]
Beginning balance	813	661	515
Provision	954	628	685
Payments or credits	(534)	(476)	(539)
Ending balance	1,233	813	661
Other Incentives/ Returns
Valuation Allowance [Line Items]
Beginning balance	35	278	77
Provision	221	134	389
Payments or credits	(82)	(377)	(188)
Ending balance	$ 174	$ 35	$ 278