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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net loss $ (2,396) $ (55)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Allowance for sales returns, doubtful accounts and other (5) (14)
Provision for excess and obsolete inventories 622 526
Depreciation and amortization 931 998
Stock-based compensation. 1,144 1,128
Deferred income taxes   102
Windfall tax benefits from stock options exercised 0 (403)
Amortization of bond premium on investments 340 439
Changes in assets and liabilities:    
Accounts receivable 413 445
Inventory (1,677) 2,097
Prepaid expenses and other assets (334) (36)
Accounts payable (1,146) (63)
Accrued expenses and other liabilities (175) 297
Deferred revenue 577 (449)
Net cash provided by (used in) operating activities (1,706) 5,012
Cash flows from investing activities:    
Purchase of investments (4,000) (19,708)
Sales and maturities of short-term investments 24,873 20,111
Purchases of property and equipment (160) (138)
Net cash provided by investing activities 20,713 265
Cash flows from financing activities:    
Repurchase of common stock (26,430)  
Windfall tax benefits from stock options exercised   403
Proceeds from issuance of common stock under employee stock plans 663 2,021
Net cash provided by (used in) financing activities (25,767) 2,424
Net increase (decrease) in cash and cash equivalents (6,760) 7,701
Cash and cash equivalents at beginning of the year 41,520 41,120
Cash and cash equivalents at end of the period 34,760 48,821
Non-cash financing activities:    
Purchases of property and equipment through accounts payable and accruals 5  
Supplemental cash flow information:    
Net cash paid for income taxes $ 52 $ 10