Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 16,626	$ 24,261
Short-term investments	48,433	40,591
Trade and other accounts receivable, net of allowances of $0 at both September 28, 2013 and at December 31, 2012	16,114	19,822
Inventories	25,794	26,193
Prepaid expenses and other current assets	1,750	2,120
Total current assets	108,717	112,987
Property, plant and equipment, net	13,065	13,426
Long-term investments	20,661	27,317
Intangible assets, net of amortization of $3,205 at September 28, 2013 and $2,887 at December 31, 2012	5,180	5,868
Deferred income taxes and other long-term assets	13,730	12,905
Total assets	161,353	172,503
Current liabilities:
Accounts payable	4,719	4,479
Accrued payroll and related liabilities	5,246	4,194
Other accrued liabilities	6,111	8,489
Customer advances	5,862	2,193
Deferred income taxes	1,281	1,281
Total current liabilities	23,219	20,636
Other long-term liabilities	9,250	9,232
Stockholders' equity:
Common stock, $0.001 par value	24	23
Additional paid-in capital	155,701	151,996
Accumulated other comprehensive income	733	769
Accumulated deficit	(27,574)	(10,153)
Total stockholders' equity	128,884	142,635
Total liabilities and stockholders' equity	$ 161,353	$ 172,503