Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets :
Cash and cash equivalents	$ 34,571	$ 28,739
Restricted cash	4,050	0
Trade and other accounts receivable, net of allowance for doubtful accounts of $140 and $244 at June 30, 2013 and December 31, 2012, respectively	35,217	33,420
Inventories	39,435	41,620
Prepaid expenses and other current assets	3,443	3,228
Total current assets	116,716	107,007
Property and equipment, net	39,519	36,235
Intangible assets, net	484	669
Goodwill	24,710	25,416
Pension asset	7,179	6,939
Other non-current assets	216	206
Total assets	188,824	176,472
Current liabilities:
Accounts payable and accrued liabilities	32,635	27,181
Accrued warranty	176	269
Accrued employee compensation	7,253	4,743
Deferred revenue	8,906	6,408
Short-term borrowings and current portion of long-term debt	8,573	9,452
Deferred tax liability	980	980
Total current liabilities	58,523	49,033
Deferred tax liability, long-term	1,368	1,384
Long-term debt, excluding current portion	75	83
Other long-term liabilities	950	1,039
Total liabilities	60,916	51,539
Commitments and contingencies (Note 10)
Stockholders' equity:
Common stock, $0.10 par value per share, 40,000 shares authorized; 29,535 and 29,162 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	2,951	2,913
Additional paid-in capital	269,726	267,623
Accumulated deficit	(155,007)	(158,134)
Accumulated other comprehensive income	10,238	12,531
Total stockholders' equity	127,908	124,933
Total liabilities and stockholders' equity	$ 188,824	$ 176,472