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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
ASSETS.    
Cash and cash equivalents $ 34,760 $ 41,520
Short-term investments 27,971 39,412
Accounts receivable, net 7,830 8,238
Inventories 9,240 8,185
Prepaid expenses and other current assets 5,471 5,152
Total current assets 85,272 102,507
Property and equipment, net 9,006 9,683
Long-term investments 19,011 28,819
Other assets 594 668
Total assets 113,883 141,677
LIABILITIES AND STOCKHOLDERS' EQUITY    
Accounts payable 3,724 4,870
Accrued expenses and other liabilities 4,244 4,444
Deferred revenue 3,100 2,523
Total current liabilities 11,068 11,837
Income taxes payable 1,492 1,462
Total liabilities 12,560 13,299
Commitments and contingencies (Note 6)      
Stockholders' equity:    
Preferred stock: $0.001 par value authorized: 5,000,000 shares; issued and outstanding: none      
Common Stock: $0.001 par value authorized: 150,000,000 shares; issued and outstanding: 23,736,079 and 27,561,482 shares, respectively 24 28
Additional paid-in capital 31,780 56,399
Accumulated other comprehensive income (loss) (3) 33
Retained earnings 69,522 71,918
Total stockholders' equity 101,323 128,378
Total liabilities and stockholders' equity $ 113,883 $ 141,677