Restatement of Previously Issued Fiancial Statements (Quarterly Consolidated Statement of Cash Flows) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net income (loss)	$ 3,127,000	$ (921,000)
OPERATING ACTIVITIES:
Depreciation	4,228,000	3,394,000
Amortization of intangible assets	182,000	254,000
Amortization of debt discount and prepaid debt costs	30,000	26,000
Pension cost	9,000	91,000
Stock-based compensation expense	1,904,000	2,057,000
Recovery of losses on accounts receivable	(17,000)	(235,000)
Changes in operating assets and liabilities:
Trade and other accounts receivable	(2,152,000)	(6,263,000)
Inventories	2,043,000	(7,852,000)
Prepaid expenses and other assets	(267,000)	(169,000)
Accounts payable and accrued liabilities and deferred revenue	6,934,000	(1,556,000)
Accrued employee compensation	2,538,000	(604,000)
Deferred tax liability, long term	(16,000)	19,000
Other long-term liabilities	(65,000)	(2,275,000)
Net cash used in operating activities	18,478,000	(14,034,000)
INVESTING ACTIVITIES:
Purchases of property and equipment	(6,527,000)	(8,288,000)
Net cash used in investing activities	(8,827,000)	(8,288,000)
FINANCING ACTIVITIES:
Principal payments on long-term debt and short-term borrowings	(4,060,000)	(3,363,000)
Proceeds from long-term and short-term borrowings	3,318,000	8,161,000
Proceeds from sale of common stock, net of offering costs	0	10,283,000
Repurchase of shares	(44,000)	(319,000)
Proceeds from issuance of common stock under equity compensation plans	281,000	1,393,000
Net cash provided by financing activities	(2,255,000)	16,155,000
Decrease in cash and cash equivalents from operations	7,396,000	(6,167,000)
Effect of exchange rate changes on cash and cash equivalents	(1,564,000)	(812,000)
Decrease in cash and cash equivalents	5,832,000	(6,979,000)
Cash and cash equivalents, at carrying value	34,571,000	22,310,000
Scenario, Previously Reported [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net income (loss)		3,162,000
OPERATING ACTIVITIES:
Depreciation		3,394,000
Amortization of intangible assets		254,000
Amortization of debt discount and prepaid debt costs		26,000
Pension cost		91,000
Stock-based compensation expense		2,056,000
Recovery of losses on accounts receivable		(362,000)
Changes in operating assets and liabilities:
Trade and other accounts receivable		(12,160,000)
Inventories		(3,031,000)
Prepaid expenses and other assets		(32,000)
Accounts payable and accrued liabilities and deferred revenue		(4,672,000)
Accrued employee compensation		(504,000)
Deferred tax liability, long term		19,000
Other long-term liabilities		(2,275,000)
Net cash used in operating activities		(14,034,000)
INVESTING ACTIVITIES:
Purchases of property and equipment		(8,288,000)
Net cash used in investing activities		(8,288,000)
FINANCING ACTIVITIES:
Principal payments on long-term debt and short-term borrowings		(3,363,000)
Proceeds from long-term and short-term borrowings		8,161,000
Proceeds from sale of common stock, net of offering costs		10,283,000
Repurchase of shares		(319,000)
Proceeds from issuance of common stock under equity compensation plans		1,393,000
Net cash provided by financing activities		16,155,000
Decrease in cash and cash equivalents from operations		(6,167,000)
Effect of exchange rate changes on cash and cash equivalents		(812,000)
Decrease in cash and cash equivalents		(6,979,000)
Cash and cash equivalents, at carrying value		22,310,000
Restatement Adjustment [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net income (loss)		(4,083,000)
OPERATING ACTIVITIES:
Depreciation		0
Amortization of intangible assets		0
Amortization of debt discount and prepaid debt costs		0
Pension cost		0
Stock-based compensation expense		1,000
Recovery of losses on accounts receivable		127,000
Changes in operating assets and liabilities:
Trade and other accounts receivable		5,897,000
Inventories		(4,821,000)
Prepaid expenses and other assets		(137,000)
Accounts payable and accrued liabilities and deferred revenue		3,116,000
Accrued employee compensation		(100,000)
Deferred tax liability, long term		0
Other long-term liabilities		0
Net cash used in operating activities		0
INVESTING ACTIVITIES:
Purchases of property and equipment		0
Net cash used in investing activities		0
FINANCING ACTIVITIES:
Principal payments on long-term debt and short-term borrowings		0
Proceeds from long-term and short-term borrowings		0
Proceeds from sale of common stock, net of offering costs		0
Repurchase of shares		0
Proceeds from issuance of common stock under equity compensation plans		0
Net cash provided by financing activities		0
Decrease in cash and cash equivalents from operations		0
Effect of exchange rate changes on cash and cash equivalents		0
Decrease in cash and cash equivalents		0
Cash and cash equivalents, at carrying value		$ 0