Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities
Net income (loss)	$ (207)	$ 846
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	831	610
Stock-based compensation	278	277
Provision for losses in accounts receivable	31	3
Provision for inventory write-downs	75	103
Excess tax benefits from stock-based compensation awards	(28)
Loss on disposal of property and equipment	4
Foreign currency transaction loss	5	53
Changes in operating assets and liabilities:
Accounts receivable	68	(446)
Inventory	(997)	(619)
Prepaid expenses and other assets	63	(48)
Accounts payable and other liabilities	(1,812)	(1,125)
Net cash used in operating activities	(1,689)	(346)
Investing activities
Purchases of property and equipment	(433)	(676)
Payments related to acquisitions	(193)	(111)
Purchase of intellectual property	(13)	(8)
Net cash used in investing activities	(639)	(795)
Financing activities
Proceeds from issuance of common stock	96	170
Purchase of treasury stock	(1)	(90)
Excess tax benefits from stock-based compensation awards	28
Net cash provided in financing activities	123	80
Effect of exchange rate changes on cash and cash equivalents	(2)	(85)
Net decrease in cash and cash equivalents	(2,207)	(1,146)
Cash and cash equivalents at beginning of period	14,711	16,448
Cash and cash equivalents at end of period	$ 12,504	$ 15,302