Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 42,580	$ 55,509
Receivables, net of allowance for doubtful accounts of $60 and $60, respectively	7,927	8,388
Inventories, net	11,604	10,873
Deferred income taxes	3,148	3,148
Prepaid expenses and other assets	1,793	1,369
Total current assets	67,052	79,287
Long-term inventories, net	1,813	1,955
Property and equipment, net	1,790	1,708
Intangibles, net	4,115	4,258
Goodwill	3,472	3,472
Deferred income taxes	1,195	1,195
Other assets	62	64
Total assets	79,499	91,939
Current Liabilities:
Accounts payable	3,912	2,302
Accrued liabilities	2,005	2,143
Income taxes payable	0	14,782
Deferred product revenue	4,192	3,593
Total current liabilities	10,109	22,820
Deferred rent	401	422
Other long-term liabilities	2,029	2,029
Total liabilities	12,539	25,271
Shareholders' equity:
Common stock, par value $0.001, 50,000,000 shares authorized, 9,105,029 and 9,163,462 shares issued and outstanding as of December 31, 2012 and 2011, respectively	9	9
Additional paid-in capital	39,991	40,430
Retained earnings	26,960	26,229
Total shareholders' equity	66,960	66,668
Total liabilities and shareholders' equity	$ 79,499	$ 91,939