Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Current assets :
Cash and cash equivalents	$ 20,073	$ 29,289	$ 30,988	$ 39,829
Trade and other accounts receivable, net of allowance for doubtful accounts of $341 and $450 at September 30, 2012 and December 31, 2011, respectively	38,816	27,973
Inventories	43,802	33,234
Prepaid expenses and other current assets	2,975	3,152
Total current assets	105,666	93,648
Property and equipment, net	35,806	28,541
Intangible assets, net	758	1,111
Goodwill	24,826	24,887
Pension asset	6,945	6,359
Other non-current assets	38	200
Total assets	174,039	154,746
Current liabilities:
Accounts payable and accrued liabilities	31,989	36,100
Accrued warranty	244	258
Accrued employee compensation	5,025	6,343
Deferred revenue	5,149	1,042
Short-term borrowings and current portion of long-term debt	9,844	5,431
Deferred tax liability	499	499
Total current liabilities	52,750	49,673
Deferred tax liability, long-term	962	933
Long-term debt, excluding current portion	25	68
Other long-term liabilities	699	3,028
Total liabilities	54,436	53,702
Commitments and contingencies (Note 10)
Stockholders' equity:
Common stock, $0.10 par value per share, 40,000 shares authorized; 29,183 and 28,174 shares issued and outstanding at September 30, 2012 and December 31, 2011, respectively	2,915	2,815
Additional paid-in capital	267,069	252,907
Accumulated deficit	(161,000)	(165,308)
Accumulated other comprehensive income	10,619	10,630
Total stockholders' equity	119,603	101,044
Total liabilities and stockholders' equity	$ 174,039	$ 154,746