Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Cash Flows [Abstract]
Net loss Including Noncontrolling Interest	$ (13,181)	$ (13,000)	$ (31,312)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	6,580	5,921	6,721
Increase in (reduction of) allowance for doubtful accounts	40	25	28
Loss on disposal of fixed assets	22	128	5
Reduction of (increase in) accrued investment income	(6)	70	(31)
Stock-based compensation	6,976	9,649	12,328
Change in operating assets and liabilities:
Accounts receivable	19,405	(10,121)	(3,580)
Inventories	(642)	(2,106)	2,006
Deferred cost of goods sold	5,686	(3,926)	608
Other current assets	1,386	164	(402)
Accounts payable	(9,669)	8,033	2,999
Accrued liabilities	(3,250)	1,185	1,795
Deferred revenues	(7,906)	3,806	(275)
Deferred rent	(43)	(53)	(75)
Net cash provided by (used in) operating activities	5,398	(225)	(9,185)
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available-for-sale short-term investments	(83,926)	(71,978)	(62,848)
Proceeds from maturities and sales of available-for-sale short-term investments	81,957	87,850	68,847
Change in other long-term assets	(15)	(17)	27
Capital expenditures	(1,129)	(2,349)	(1,995)
Net cash provided by (used in) investing activities	(3,113)	13,506	4,031
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Principal payments of lease financing obligations	(1,971)	(1,731)	(1,588)
Proceeds from exercise of stock options	0	945	615
Proceeds from noncontrolling interests	1,960	0	0
Repurchase of common stock from employees for payment of taxes on vesting of restricted stock units and upon exercise of stock options	(1,325)	(2,265)	(2,945)
Net cash used in financing activities	(1,336)	(3,051)	(3,918)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	269	(247)	(459)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1,218	9,983	(9,531)
CASH AND CASH EQUIVALENTS:
Beginning of period	17,658	7,675	17,206
End of period	18,876	17,658	7,675
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest on lease financing obligations	1,350	1,459	1,564
Cash paid for income taxes	$ 357	$ 429	$ 0