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Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Balance at beginning of period $ 3,207 $ 2,709
Change in accruals for warranties during the period (72) 152
Settlements during the period (280) (74)
Balance at end of period $ 2,855 $ 2,787