Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Current assets:
Cash and cash equivalents	$ 95,212	$ 110,951
Marketable securities	52,851	40,841
Accounts receivable, net of allowances of $179 and $170, respectively	45,252	50,854
Inventories	63,470	61,915
Inventories-delivered systems	349	180
Prepaid expenses and other	7,235	6,140
Total current assets	264,369	270,881
Property, plant and equipment, net	50,532	47,900
Operating lease - right of use assets, net	11,567
Goodwill	26,372	26,372
Intangible assets, net	26,572	27,326
Deferred income tax assets	2,473	2,569
Other assets	440	582
Total assets	382,325	375,630
Current liabilities:
Accounts payable	18,901	16,540
Accrued payroll and related expenses	9,490	21,658
Deferred revenue	10,641	8,990
Operating lease liabilities	2,893
Other current liabilities	6,859	9,421
Income taxes payable	1,623	3,164
Total current liabilities	50,407	59,773
Deferred revenue	1,505	1,753
Income taxes payable	1,027	871
Deferred tax liabilities	166	162
Operating lease liabilities	8,614
Other long-term liabilities	220	219
Total liabilities	61,939	62,778
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $0.001 par value; 3,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.001 par value, 47,000,000 shares authorized: 24,534,582 and 24,372,193, respectively, issued and outstanding	25	24
Additional paid-in capital	251,841	247,983
Retained earnings	70,375	67,402
Accumulated other comprehensive loss	(1,855)	(2,557)
Total stockholders’ equity	320,386	312,852
Total liabilities and stockholders’ equity	$ 382,325	$ 375,630