Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES:
Net loss	$ (10,226)	$ (3,252)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	1,394	1,192
Depreciation and amortization	1,602	1,809
Deferred income taxes	(410)	(521)
Changes in assets and liabilities
Accounts receivable	512	3,936
Inventories	(312)	(1,186)
Prepaid expenses and other assets	(1,545)	(539)
Accounts payable	2,263	(638)
Deferred revenue	37	84
Accrued expenses and other liabilities	(989)	(2,241)
Net cash used in operating activities	(7,674)	(1,356)
INVESTING ACTIVITIES:
Purchases of property and equipment	(480)	(306)
Net cash used in investing activities	(480)	(306)
FINANCING ACTIVITIES:
Repayments of long-term debt		(125)
Proceeds from exercise of stock options	301	2,162
Repurchase of common stock	(743)	(1,452)
Net cash (used in) provided by financing activities	(442)	585
EFFECT OF FOREIGN EXCHANGE RATE CHANGES ON CASH	(16)	13
NET DECREASE IN CASH	(8,612)	(1,064)
CASH, BEGINNING OF PERIOD	87,888	23,878
CASH, END OF PERIOD	79,276	22,814
Cash paid for:
Interest		76
Income taxes	$ 27	$ 20