Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets :
Cash and cash equivalents	$ 34,124	$ 28,739
Trade and other accounts receivable, net of allowance for doubtful accounts of $167 and $157 at March 31, 2013 and December 31, 2012, respectively	32,819	33,420
Inventories	42,336	41,620
Prepaid expenses and other current assets	3,090	3,228
Total current assets	112,369	107,007
Property and equipment, net	36,165	36,235
Intangible assets, net	575	669
Goodwill	24,603	25,416
Pension asset	6,918	6,939
Other non-current assets	212	206
Total assets	180,842	176,472
Current liabilities:
Accounts payable and accrued liabilities	31,206	27,181
Accrued warranty	267	269
Accrued employee compensation	5,889	4,743
Deferred revenue	7,994	6,408
Short-term borrowings and current portion of long-term debt	8,973	9,452
Deferred tax liability	980	980
Total current liabilities	55,309	49,033
Deferred tax liability, long-term	1,376	1,384
Long-term debt, excluding current portion	85	83
Other long-term liabilities	979	1,039
Total liabilities	57,749	51,539
Commitments and contingencies (Note 10)
Stockholders' equity:
Common stock, $0.10 par value per share, 40,000 shares authorized; 29,562 and 29,162 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	2,953	2,913
Additional paid-in capital	268,801	267,623
Accumulated deficit	(158,412)	(158,134)
Accumulated other comprehensive income	9,751	12,531
Total stockholders' equity	123,093	124,933
Total liabilities and stockholders' equity	$ 180,842	$ 176,472