Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 27,337	$ 20,121
Short-term investments	40,037	48,975
Trade and other accounts receivable, net of allowances of $0 at both March 29, 2014 and at December 31, 2013	15,254	15,037
Inventories	20,744	22,762
Prepaid expenses and other current assets	1,391	1,237
Total current assets	104,763	108,132
Property, plant and equipment, net	13,389	12,945
Long-term investments	7,659	12,318
Intangible assets, net of amortization of $3,719 at March 29, 2014 and $3,485 at December 31, 2013	4,668	4,902
Deferred income taxes and other long-term assets	10,081	9,979
Total assets	140,560	148,276
Current liabilities:
Accounts payable	4,082	4,011
Accrued payroll and related liabilities	3,622	5,034
Other accrued liabilities	2,615	3,263
Customer advances	1,955	3,743
Deferred income taxes	939	939
Total current liabilities	13,213	16,990
Other long-term liabilities	1,847	1,715
Stockholders' equity:
Common stock, $0.001 par value	24	24
Additional paid-in capital	157,885	156,359
Treasury Stock, 379 shares at March 29, 2014 and 241 shares at December 31, 2013	(2,738)	(1,688)
Accumulated other comprehensive income	699	725
Accumulated deficit	(30,370)	(25,849)
Total stockholders' equity	125,500	129,571
Total liabilities and stockholders' equity	$ 140,560	$ 148,276