Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014
Cash flows from operating activities:
Net income	$ 10,909	$ 4,918
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	2,196	2,192
Stock-based compensation	1,670	1,085
Other non-cash items	123	108
Changes in assets and liabilities:
Accounts receivable	9,784	(5,636)
Advance billings	1,801	761
Inventories	(4,909)	(5,589)
Prepaid expenses and other assets	3,185	(1,462)
Accounts payable	(8,554)	(14,145)
Accrued compensation and benefits and other current liabilities	963	2,510
Deferred revenues	(2,961)	(3,127)
Other liabilities	98	(138)
Net cash provided by (used in) operating activities	14,305	(18,523)
Cash flows from investing activities:
Purchases of property and equipment	(1,114)	(738)
Other	167	80
Net cash used in investing activities	(947)	(658)
Cash flows from financing activities:
Repayment of revolving credit facility	0	(14,000)
Proceeds from issuance of common stock, net	1,483	31,972
Net cash provided by financing activities	1,483	17,972
Effect of exchange rate changes on cash and cash equivalents	(902)	(920)
Net increase (decrease) in cash and cash equivalents	13,939	(2,129)
Cash and cash equivalents, beginning of period	22,760	14,578
Cash and cash equivalents, end of period	36,699	12,449
Supplemental disclosure of non-cash transactions:
Transfer of inventories into property and equipment	$ 1,988	$ 0