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, 2016
Mar. 31, 2015
Mar. 31, 2014
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance $ 53 $ 40 $ 10
Valuation Allowances and Reserves, Charged to Cost and Expense 168 85 30
Valuation Allowances and Reserves, Deductions [1] (168) (72)  
Valuation Allowances and Reserves, Ending Balance 53 53 40
Inventory Valuation Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance 9,047 4,266 2,032
Valuation Allowances and Reserves, Charged to Cost and Expense 621 5,674 2,881
Valuation Allowances and Reserves, Deductions [2] (92) (893) (647)
Valuation Allowances and Reserves, Ending Balance 9,576 9,047 4,266
Valuation Allowance of Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance 39,667 29,414 36,285
Valuation Allowances and Reserves, Charged to Cost and Expense [3] 7,016 10,253  
Valuation Allowances and Reserves, Deductions [3]     (6,871)
Valuation Allowances and Reserves, Ending Balance 46,683 39,667 29,414
Allowance for Sales Returns [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves,Beginning Balance 355 42 19
Valuation Allowances and Reserves, Charged to Cost and Expense 572 973 189
Valuation Allowances and Reserves, Deductions (772) (660) (166)
Valuation Allowances and Reserves, Ending Balance $ 155 $ 355 $ 42
[1] Accounts written off, including early pay discounts, net of recoveries.
[2] Inventory loss charged against inventory reserves.
[3] Change in valuation allowance due to assessment of realizability of deferred tax assets and, in fiscal year 2016, the impact of the early adoption of ASU 2016-09.