CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 159,599	$ 111,795
Short-term investments	190,417	234,294
Accounts receivable	9,580	10,727
Inventory	8,571	3,843
Other current assets	3,902	1,645
Total current assets	372,069	362,304
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $19,663 and $18,735	12,011	10,884
ACQUIRED TECHNOLOGY, net of accumulated amortization of $17,029 and $17,000	380	391
INVESTMENTS	1,172	0
OTHER ASSETS	289	299
TOTAL ASSETS	385,921	373,878
CURRENT LIABILITIES:
Accounts payable	7,071	4,776
Accrued expenses	7,920	9,020
Deferred revenue	5,338	5,534
Other current liabilities	589	187
Total current liabilities	20,918	19,517
DEFERRED REVENUE	3,568	3,874
RETIREMENT PLAN BENEFIT LIABILITY	8,543	8,260
Total liabilities	33,029	31,651
SHAREHOLDERS' EQUITY:
Preferred Stock, par value $0.01 per share, 5,000,000 shares authorized, 200,000 shares of Series A Nonconvertible Preferred Stock issued and outstanding (liquidation value of $7.50 per share or $1,500,000)	2	2
Common Stock, par value $0.01 per share, 100,000,000 shares authorized, 46,453,060 and 46,113,296 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	465	461
Additional paid-in capital	562,152	561,492
Accumulated deficit	(204,128)	(213,871)
Accumulated other comprehensive loss	(5,599)	(5,857)
Total shareholders' equity	352,892	342,227
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 385,921	$ 373,878