Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Statement of Cash Flows [Abstract]
Net loss Including Noncontrolling Interest	$ (8,869)	$ (8,805)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	5,308	4,530
Increase in (reduction of) allowance for doubtful accounts	17	(13)
Loss on disposal of fixed assets	0	92
Reduction of (increase in) accrued investment income	(3)	64
Stock-based compensation	5,565	6,744
Change in operating assets and liabilities:
Accounts receivable	18,244	(1,920)
Inventories	587	(1,619)
Deferred cost of goods sold	5,611	762
Other current assets	981	(1,147)
Accounts payable	(9,279)	2,998
Accrued liabilities	(3,597)	892
Deferred revenues	(7,290)	(1,975)
Deferred rent	(33)	(41)
Net cash provided by operating activities	7,242	562
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available-for-sale short-term investments	(66,947)	(38,978)
Proceeds from maturities and sales of available-for-sale short-term investments	63,970	58,862
Change in other long-term assets	(20)	(10)
Capital expenditures	(814)	(1,965)
Net cash provided by (used in) investing activities	(3,811)	17,909
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Principal payments of lease financing obligations	(1,461)	(1,286)
Proceeds from exercise of stock options	0	945
Proceeds from noncontrolling interests	294	0
Repurchase of common stock from employees for payment of taxes on vesting of restricted stock units and upon exercise of stock options	(1,249)	(2,093)
Net cash used in financing activities	(2,416)	(2,434)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	13	(27)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1,028	16,010
CASH AND CASH EQUIVALENTS:
Beginning of period	17,658	7,675
End of period	18,686	23,685
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest on lease financing obligations	1,024	1,104
Cash paid for income taxes	$ 241	$ 297