Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014
Cash flows from operating activities:
Net income	$ 8,886	$ 4,381
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	1,205	1,378
Stock-based compensation	1,094	685
Other non-cash items	195	93
Changes in assets and liabilities:
Accounts receivable	7,225	1,768
Advance billings	1,324	(493)
Inventories	(5,088)	(9,279)
Prepaid expenses and other assets	1,822	(994)
Accounts payable	(9,141)	(6,752)
Accrued compensation and benefits and other current liabilities	2,331	1,582
Deferred revenues	(2,144)	(3,165)
Other liabilities	263	(88)
Net cash provided by (used in) operating activities	7,972	(10,884)
Cash flows from investing activities:
Purchases of property and equipment	(1,050)	(452)
Other	0	1
Net cash used in investing activities	(1,050)	(451)
Cash flows from financing activities:
Repayment of revolving credit facility	0	(14,000)
Proceeds from issuance of common stock, net	1,302	31,921
Net cash provided by financing activities	1,302	17,921
Effect of exchange rate changes on cash and cash equivalents	(121)	(497)
Net increase in cash and cash equivalents	8,103	6,089
Cash and cash equivalents, beginning of period	22,760	14,578
Cash and cash equivalents, end of period	30,863	20,667
Supplemental disclosure of non-cash transactions:
Transfer of inventories into property and equipment	$ 1,988	$ 0