Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Cash Flows [Abstract]
Net loss Including Noncontrolling Interest	$ (9,395)	$ (2,568)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	1,058	1,352
Increase in (reduction of) allowance for doubtful accounts	11	(60)
Loss on disposal of fixed assets	3	0
Reduction of (increase in) accrued investment income	(6)	13
Stock-based compensation	1,383	2,817
Change in operating assets and liabilities:
Accounts receivable	609	9,570
Inventories	1,172	(7,267)
Deferred cost of goods sold	(117)	5,433
Other current assets	(514)	1,486
Accounts payable	(809)	(1,915)
Accrued liabilities	5,197	(2,567)
Deferred revenues	(297)	(5,573)
Deferred rent	(9)	(12)
Net cash provided by operating activities	(1,714)	709
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available-for-sale short-term investments	(12,984)	(24,986)
Proceeds from maturities and sales of available-for-sale short-term investments	12,990	27,982
Change in other long-term assets	6	(8)
Capital expenditures	(172)	(360)
Net cash provided by (used in) investing activities	(160)	2,628
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Principal payments of lease financing obligations	(503)	(469)
Proceeds from exercise of stock options	0	0
Proceeds from noncontrolling interests	0	0
Repurchase of common stock from employees for payment of taxes on vesting of restricted stock units and upon exercise of stock options	(17)	(246)
Net cash used in financing activities	(520)	(715)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(392)	166
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(2,786)	2,788
CASH AND CASH EQUIVALENTS:
Beginning of period	18,876	17,658
End of period	16,090	20,446
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest on lease financing obligations	318	349
Cash paid for income taxes	$ 123	$ 56