Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Cash Flows [Abstract]
Net loss Including Noncontrolling Interest	$ (18,418)	$ (13,181)	$ (13,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,020	6,580	5,921
Increase in allowance for doubtful accounts	47	40	25
Loss on disposal of fixed assets	30	22	128
Reduction of (increase in) accrued investment income	(6)	(6)	70
Stock-based compensation	2,538	6,976	9,649
Change in operating assets and liabilities:
Accounts receivable	5,151	19,405	(10,121)
Inventories	5,284	(642)	(2,106)
Deferred cost of goods sold	(797)	5,686	(3,926)
Other current assets	450	1,386	164
Accounts payable	(2,925)	(9,669)	8,033
Accrued liabilities	2,605	(3,250)	1,185
Deferred revenues	978	(7,906)	3,806
Deferred rent	(36)	(43)	(53)
Net cash (used in) provided by operating activities	(1,079)	5,398	(225)
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available-for-sale short-term investments	(46,947)	(83,926)	(71,978)
Proceeds from maturities and sales of available-for-sale short-term investments	46,946	81,957	87,850
Change in other long-term assets	(51)	(15)	(17)
Capital expenditures	(971)	(1,129)	(2,349)
Net cash (used in) provided by investing activities	(1,023)	(3,113)	13,506
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Principal payments of lease financing obligations	(2,056)	(1,971)	(1,731)
Proceeds from exercise of stock options	0	0	945
Proceeds from noncontrolling interests	0	1,960	0
Repurchase of common stock from employees for payment of taxes on vesting of restricted stock units and upon exercise of stock options	(453)	(1,325)	(2,265)
Net cash used in financing activities	(2,509)	(1,336)	(3,051)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	383	269	(247)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(4,228)	1,218	9,983
CASH AND CASH EQUIVALENTS:
Beginning of period	18,876	17,658	7,675
End of period	14,648	18,876	17,658
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest on lease financing obligations	1,224	1,350	1,459
Cash paid for income taxes	$ 459	$ 357	$ 429