Summary of Product Revenue Allowances and Reserve Categories (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Jun. 30, 2015
Valuation Allowance [Line Items]
Beginning balance	$ 3,701	$ 2,527	$ 2,527
Provision	4,387	2,570	3,794
Payments or credits	(3,835)	(2,031)	(3,159)
Ending balance	4,253	3,066	3,701
Trade Allowances
Valuation Allowance [Line Items]
Beginning balance	114	72	72
Provision	298	255	304
Payments or credits	(302)	(228)	(289)
Ending balance	110	99	114
Rebates Chargebacks and Discounts
Valuation Allowance [Line Items]
Beginning balance	3,001	2,095	2,095
Provision	3,997	2,097	3,262
Payments or credits	(3,314)	(1,645)	(2,808)
Ending balance	3,684	2,547	3,001
Other Incentives/ Returns
Valuation Allowance [Line Items]
Beginning balance	586	360	360
Provision	92	218	228
Payments or credits	(219)	(158)	(62)
Ending balance	$ 459	$ 420	$ 586