Restatement of Previously Issued Fiancial Statements (Quarterly Consolidated Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net income (loss)	$ 9,154	$ 4,307
OPERATING ACTIVITIES:
Depreciation	6,518	5,104
Amortization of intangible assets	247	351
Amortization of debt discount and prepaid debt costs	46	42
Pension cost	15	135
Stock-based compensation expense	2,622	2,561
Recovery of losses on accounts receivable	(24)	(110)
Changes in operating assets and liabilities:
Trade and other accounts receivable	4,081	(10,782)
Inventories	(861)	(10,570)
Prepaid expenses and other assets	(82)	339
Accounts payable and accrued liabilities	2,016	(4,078)
Deferred Revenue	(3,814)	4,107
Accrued employee compensation	3,570	723
Deferred tax liability, long term	(8)	(1,396)
Other long-term liabilities	1,235	(2,326)
Net cash used in operating activities	24,715	(11,593)
INVESTING ACTIVITIES:
Purchases of property and equipment	(11,716)	(13,121)
Net cash used in investing activities	(14,016)	(13,121)
FINANCING ACTIVITIES:
Principal payments on long-term debt and short-term borrowings	(7,782)	(6,890)
Proceeds from long-term and short-term borrowings	6,475	11,230
Proceeds from sale of common stock, net of offering costs	0	10,283
Repurchase of shares	(47)	(319)
Proceeds from issuance of common stock under equity compensation plans	305	1,737
Net cash provided by financing activities	(2,799)	16,041
Decrease in cash and cash equivalents from operations	7,900	(8,673)
Effect of exchange rate changes on cash and cash equivalents	408	(543)
Decrease in cash and cash equivalents	8,308	(9,216)
Cash and cash equivalents, at carrying value	37,047	20,073
Scenario, Previously Reported [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net income (loss)		8,565
OPERATING ACTIVITIES:
Depreciation		5,104
Amortization of intangible assets		351
Amortization of debt discount and prepaid debt costs		42
Pension cost		135
Stock-based compensation expense		2,561
Recovery of losses on accounts receivable		(237)
Changes in operating assets and liabilities:
Trade and other accounts receivable		(16,673)
Inventories		(4,700)
Prepaid expenses and other assets		478
Accounts payable and accrued liabilities		(3,892)
Deferred Revenue		266
Accrued employee compensation		(1,296)
Deferred tax liability, long term		29
Other long-term liabilities		(2,326)
Net cash used in operating activities		(11,593)
INVESTING ACTIVITIES:
Purchases of property and equipment		(13,121)
Net cash used in investing activities		(13,121)
FINANCING ACTIVITIES:
Principal payments on long-term debt and short-term borrowings		(6,890)
Proceeds from long-term and short-term borrowings		11,230
Proceeds from sale of common stock, net of offering costs		10,283
Repurchase of shares		(319)
Proceeds from issuance of common stock under equity compensation plans		1,737
Net cash provided by financing activities		16,041
Decrease in cash and cash equivalents from operations		(8,673)
Effect of exchange rate changes on cash and cash equivalents		(543)
Decrease in cash and cash equivalents		(9,216)
Cash and cash equivalents, at carrying value		20,073
Restatement Adjustment [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net income (loss)		(4,258)
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		0
Recovery of losses on accounts receivable		127
Changes in operating assets and liabilities:
Trade and other accounts receivable		5,891
Inventories		(5,870)
Prepaid expenses and other assets		(139)
Accounts payable and accrued liabilities		(186)
Deferred Revenue		3,841
Accrued employee compensation		2,019
Deferred tax liability, long term		(1,425)
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