CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 30, 2017
Current assets:
Cash and cash equivalents	$ 21,753	$ 19,941
Short-term investments	17,175	15,698
Trade and other accounts receivable, net of allowances of $0 at both September 29, 2018 and at December 30, 2017	18,835	20,474
Inventories	34,679	33,792
Prepaid expenses and other current assets	2,610	2,524
Total current assets	95,052	92,429
Property, plant and equipment, net	11,046	12,478
Long-term investments	5,164	6,849
Restricted cash	1,569	1,000
Intangible assets, net of accumulated amortization of $7,345 at September 29, 2018 and $6,884 at December 30, 2017	1,042	1,503
Deferred income taxes and other long-term assets	744	764
Total assets	114,617	115,023
Current liabilities:
Accounts payable	5,956	3,949
Accrued payroll and related liabilities	4,272	6,818
Other accrued liabilities	10,995	7,688
Customer advances	11,616	11,026
Total current liabilities	32,839	29,481
Other long-term liabilities	2,436	2,879
Stockholders' equity:
Common stock, $0.001 par value	23	22
Additional paid-in capital	182,354	177,521
Treasury stock, 4,845 shares at both September 29, 2018 and December 30, 2017	(28,489)	(28,489)
Accumulated other comprehensive income	371	490
Accumulated deficit	(74,917)	(66,881)
Total stockholders' equity	79,342	82,663
Total liabilities and stockholders' equity	$ 114,617	$ 115,023