Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 26, 2016	Dec. 26, 2015
Current assets:
Cash and cash equivalents	$ 38,673	$ 38,154
Marketable securities	44,672	44,931
Accounts receivable, net of allowances of $145 and $150, respectively	44,482	37,832
Inventories	49,893	47,749
Inventories-delivered systems	4,138	2,856
Prepaid expenses and other	6,060	6,592
Total current assets	187,918	178,114
Property, plant and equipment, net	43,068	44,493
Goodwill	9,592	9,415
Intangible assets, net	1,425	1,867
Deferred income tax assets	1,191	1,118
Other assets	525	533
Total assets	243,719	235,540
Current liabilities:
Accounts payable	13,212	11,675
Accrued payroll and related expenses	8,592	10,097
Deferred revenue	16,010	12,790
Other current liabilities	8,978	8,878
Income taxes payable	704	1,771
Total current liabilities	47,496	45,211
Deferred revenue	250	827
Income taxes payable	805	775
Deferred tax liability	563	521
Other long-term liabilities	859	878
Total liabilities	$ 49,973	$ 48,212
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: 24,371,657 and 24,224,286, respectively, issued and outstanding	24	24
Additional paid-in capital	260,679	258,715
Accumulated deficit	(62,742)	(66,209)
Accumulated other comprehensive income	(4,215)	(5,202)
Total stockholders’ equity	193,746	187,328
Total liabilities and stockholders’ equity	$ 243,719	$ 235,540