Annual report pursuant to Section 13 and 15(d)

Schedule II Valuation and Qualifying Accounts (Details)

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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance $ 40 $ 10 $ 12
Valuation Allowances and Reserves, Charged to Cost and Expense 85 30 0
Valuation Allowances and Reserves, Additions (Deductions) [1] (72)   (2)
Valuation Allowances and Reserves, Ending Balance 53 40 10
Inventory Valuation Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance 4,266 2,032 1,479
Valuation Allowances and Reserves, Charged to Cost and Expense 5,674 2,881 1,090
Valuation Allowances and Reserves, Additions (Deductions) [2] (893) (647) (537)
Valuation Allowances and Reserves, Ending Balance 9,047 4,266 2,032
Valuation Allowance of Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance 29,414 [3] 36,285 2,253
Valuation Allowances and Reserves, Additions (Deductions) [3],[4]   (6,871)  
Valuation Allowances and Reserves, Adjustments [4] 10,253   34,032
Valuation Allowances and Reserves, Ending Balance 39,667 [3] 29,414 [3] 36,285
Allowance for Sales Returns [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance [5] 42 19 13
Valuation Allowances and Reserves, Charged to Cost and Expense [5] 973 189 218
Valuation Allowances and Reserves, Additions (Deductions) [5] (660) (166) (212)
Valuation Allowances and Reserves, Ending Balance [5] $ 355 $ 42 $ 19
[1] Accounts written off, net of recoveries.
[2] Inventory charged against inventory reserves.
[3] See Note 1 for restatement information.
[4] Change in valuation allowance due to assessment of realizability of deferred tax assets.
[5] Included in allowance for account receivable.