Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 29, 2018
Current assets:
Cash and cash equivalents	$ 94,035	$ 110,951
Marketable securities	50,947	40,841
Accounts receivable, net of allowances of $209 and $170, respectively	51,602	50,854
Inventories	66,630	61,915
Inventories-delivered systems	1,010	180
Prepaid expenses and other	7,955	6,140
Total current assets	272,179	270,881
Property, plant and equipment, net	52,779	47,900
Operating lease - right of use assets, net	10,767
Goodwill	26,310	26,372
Intangible assets, net	25,811	27,326
Deferred income tax assets	2,807	2,569
Other assets	446	582
Total assets	391,099	375,630
Current liabilities:
Accounts payable	19,459	16,540
Accrued payroll and related expenses	10,361	21,658
Deferred revenue	9,865	8,990
Operating lease liabilities	2,845
Other current liabilities	7,308	9,421
Income taxes payable	1,117	3,164
Total current liabilities	50,955	59,773
Deferred revenue	1,616	1,753
Income taxes payable	1,150	871
Deferred tax liabilities	163	162
Operating lease liabilities	8,017
Other long-term liabilities	218	219
Total liabilities	62,119	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: 24,828,384 and 24,372,193, respectively, issued and outstanding	25	24
Additional paid-in capital	256,503	247,983
Retained earnings	74,305	67,402
Accumulated other comprehensive loss	(1,853)	(2,557)
Total stockholders’ equity	328,980	312,852
Total liabilities and stockholders’ equity	$ 391,099	$ 375,630