Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
Revenue, Accounts Receivable and Credit Policies
Bill and hold sales	$ 0	$ 6,840	$ 9,026
Number of long-term contracts/programs	2
Number of claims recorded	0
Changes in allowance for doubtful accounts
Balance at the beginning of the period	1	216
Write-offs	(2)	(6)
Provision for (recovery of) doubtful accounts	1	(209)
Balance at the end of the period	0	1	216
Period from the balance sheet date within which there are no material amounts not expected to be collected	1 year
Property and equipment
Depreciation and amortization	4,891	4,633	3,712
Property and equipment, gross, excluding Construction in process	47,207	43,050
Less accumulated depreciation and amortization	(28,162)	(23,531)
Property and equipment, net, excluding Construction in process	19,045	19,519
Construction in process	3,089	3,070
Property and equipment, net	22,134	22,589
Changes in the carrying amount of goodwill
Balance at the beginning of the period	14,713	14,950
Effect of foreign currency translation	234	(237)
Balance at the end of the period	14,947	14,713	14,950
Goodwill
Accumulated impairment	1,245	1,245
Goodwill book value	16,192	16,192
Impairment of goodwill	0	0	0
Land
Property and equipment
Property and equipment, gross, excluding Construction in process	362	354
Building
Property and equipment
Property and equipment, gross, excluding Construction in process	2,718	2,521
Estimated Useful Life	33 years
Machinery and equipment
Property and equipment
Property and equipment, gross, excluding Construction in process	37,749	34,086
Machinery and equipment | Minimum
Property and equipment
Estimated Useful Life	7 years
Machinery and equipment | Maximum
Property and equipment
Estimated Useful Life	10 years
Furniture, fixtures and leasehold improvements
Property and equipment
Property and equipment, gross, excluding Construction in process	$ 6,378	$ 6,089
Furniture, fixtures and leasehold improvements | Minimum
Property and equipment
Estimated Useful Life	3 years
Furniture, fixtures and leasehold improvements | Maximum
Property and equipment
Estimated Useful Life	5 years