Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 8,334	$ 3,564
Marketable securities	4,817	2,639
Accounts receivable, net of allowance for doubtful accounts of $1,173 and $796	6,722	5,252
Inventories	4,485	3,589
Prepaid expenses and other current assets	1,611	1,414
Deferred income taxes	186
Total current assets	26,155	16,458
Property and equipment:
Furniture and fixtures	461	620
Leasehold improvements	471	511
Equipment	4,427	3,988
Property and equipment, gross	5,359	5,119
Accumulated depreciation	3,484	4,094
Property and equipment, net	1,875	1,025
Deferred income taxes	4,017	139
Intangible assets, net	6,489	6,463
Other assets		300
TOTAL ASSETS	38,536	24,385
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	2,112	2,409
Accrued compensation	949	1,202
Warranty and other current liabilities	1,086	1,959
Total current liabilities	4,147	5,570
Deferred income taxes	241	175
Other long-term liabilities	168	126
Shareholders':
Common stock, $.01 par value; 20,000,000 shares authorized, 4,974,847 and 4,966,619	49	49
Additional paid-in capital	23,055	23,276
Accumulated other comprehensive income	390	604
Retained earnings	10,486	(5,415)
Total shareholders' equity	33,980	18,514
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 38,536	$ 24,385