CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
ASSETS.
Cash and cash equivalents	$ 43,346	$ 41,520
Short-term investments	40,660	39,412
Accounts receivable, net	8,958	8,238
Inventories	8,363	8,185
Prepaid expenses and other current assets	4,890	5,152
Total current assets	106,217	102,507
Property and equipment, net	9,242	9,683
Long-term investments	23,045	28,819
Other assets	634	668
Total assets	139,138	141,677
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	3,627	4,870
Accrued expenses and other liabilities	3,463	4,444
Deferred revenue	3,658	2,523
Total current liabilities	10,748	11,837
Income taxes payable	1,477	1,462
Total liabilities	12,225	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: 27,499,632 and 27,561,482 shares, respectively	27	28
Additional paid-in capital	56,376	56,399
Accumulated other comprehensive income	38	33
Retained earnings	70,472	71,918
Total stockholders' equity	126,913	128,378
Total liabilities and stockholders' equity	$ 139,138	$ 141,677