Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (6,168)	$ (6,711)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	1,673	1,843
Provision for doubtful accounts	(51)	(165)
Deferred taxes	279	4,808
Foreign currency transaction (gains) losses	87	(12)
Realized (gains) losses on available-for-sale securities	21	(8)
Unrealized loss on available-for-sale equity security		42
Stock compensation costs	447	449
Changes in operating assets and liabilities:
Accounts receivable	(382)	5,945
Inventories	561	(1,801)
Income tax refunds receivable	1,325	(1,129)
Other assets	31	154
Accounts payable	182	(1,696)
Advance customer payments	8	(299)
Accrued expenses	(253)	(1,412)
Net cash provided by (used in) operating activities	(2,240)	8
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of available-for-sale marketable securities	8,341	13,241
Proceeds from sales of available-for-sale marketable securities	5,047	3,154
Purchases of available-for-sale marketable securities	(11,648)	(21,630)
Additions to equipment and leasehold improvements	(681)	(1,350)
Additions to patents	(68)	(113)
Net cash provided by (used in) investing activities	991	(6,698)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	25	27
Common stock repurchases	(2,979)	(21)
Proceeds from issuance of common stock under employee stock purchase plan	65	139
Net cash provided by (used in) financing activities	(2,889)	145
Effects of exchange rate changes on cash and cash equivalents	(101)	94
Net decrease in cash and cash equivalents	(4,239)	(6,451)
Cash and cash equivalents - beginning of period	7,340	13,791
Cash and cash equivalents - end of period	$ 3,101	$ 7,340