Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash	$ 79,276	$ 87,888
Accounts receivable, net of allowance for doubtful accounts of $330 and $285	16,955	17,545
Inventories	13,056	12,758
Prepaid expenses	3,212	1,719
Other current assets	387	493
Total current assets	112,886	120,403
PROPERTY AND EQUIPMENT, net	18,297	18,546
INTANGIBLE ASSETS, net	25,749	27,207
GOODWILL	24,823	25,445
OTHER ASSETS	281	124
TOTAL ASSETS	182,036	191,725
CURRENT LIABILITIES:
Accounts payable	5,622	3,380
Deferred revenue	5,611	5,580
Accrued expenses	6,756	7,960
Total current liabilities	17,989	16,920
OTHER LIABILITIES	249	89
DEFERRED INCOME TAXES	3,881	4,401
COMMITMENTS AND CONTINGENCIES (Note 6)
STOCKHOLDERS' EQUITY
Preferred stock, par value $.000001, 25,000 shares authorized, none issued
Common stock, par value $.000001, 120,000 shares authorized, 55,530 and 55,281 shares issued and outstanding
Additional paid-in capital	334,475	333,522
Accumulated other comprehensive loss	(1,791)	(666)
Accumulated deficit	(172,767)	(162,541)
Total stockholders' equity	159,917	170,315
Total liabilities and stockholders' equity	$ 182,036	$ 191,725