Balance Sheet Components - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Nov. 30, 2011
Balance Sheet Details [Line Items]
Depreciation expense incurred	$ 1,400,000	$ 1,000,000	$ 800,000
Product formula purchase price	2,000,000			2,000,000
Product formula purchase agreement period	7 years
Annual payment for product formula purchases	150,000
Number of years annual payment is required	6 years
Amortization expense	61,000	60,000	27,000
Future Amortization Expense 2015	61,000
Future Amortization Expense 2016	61,000
Future Amortization Expense 2017	61,000
Future Amortization Expense 2018	61,000
Future Amortization Expense 2019	61,000
Future Amortization Expense, next five years	305,000
Amortization expense thereafter	750,000
Prepaid expenses and other current assets	4,277,000	5,050,000
Contract manufacturers and suppliers
Balance Sheet Details [Line Items]
Prepaid expenses and other current assets	$ 2,700,000	$ 3,900,000