Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net loss	$ (43,413)	$ (89,266)	$ (24,892)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	8,949	12,337	17,868
Loss on goodwill and purchased intangible assets impairment	0	49,521	3,277
Impairment loss on equipment, leasehold improvements and software license intangible assets	418	100	203
Provision for bad debts	1,936	439	40
Net impairment loss on marketable securities	0	39	346
Inventory provision	4,344	2,843	689
Share-based compensation expense	3,443	7,500	5,983
Contingent loss for litigation	14,326	0	0
Non-cash income tax expense (benefit)	220	462	(9,185)
Changes in assets and liabilities:
Accounts receivable	730	(6,242)	26,437
Inventories	6,879	420	122
Prepaid expenses and other assets	(489)	(1,237)	3,661
Accounts payable	(19,237)	(10,433)	(24,293)
Accrued expenses, income taxes, and other	(4,733)	3,638	(1,787)
Net cash used in operating activities	(26,627)	(29,879)	(1,531)
Cash flows from investing activities:
Purchases of property and equipment	(5,011)	(4,579)	(5,987)
Purchases of intangible assets	0	(104)	(284)
Purchases of marketable securities	(24,262)	(44,216)	(36,992)
Marketable securities maturities / sales	40,897	46,696	74,922
Net cash provided by (used in) investing activities	11,624	(2,203)	31,659
Cash flows from financing activities:
Proceeds from the issuance of short-term debt, net of issuance costs	20,300	14,000	12,000
Principal repayments of short-term debt	(17,734)	(14,000)	(12,000)
Principal payments under capital lease obligations	0	(46)	(109)
Proceeds from stock option exercises and ESPP net of taxes paid on vested restricted stock units	(552)	1,166	(196)
Net cash provided by (used in) financing activities	2,014	1,120	(305)
Effect of exchange rates on cash and cash equivalents	(144)	(63)	(129)
Net increase (decrease) in cash and cash equivalents	(13,133)	(31,025)	29,694
Cash and cash equivalents, beginning of period	16,044	47,069	17,375
Cash and cash equivalents, end of period	2,911	16,044	47,069
Cash paid during the year for:
Interest	65	17	8
Income taxes	121	104	112
Supplemental disclosures of non-cash investing activities:
Building rent incentives to fund leasehold improvements	359	0	1,869
Supplemental disclosures of non-cash financing activities:
Marketable equity securities received in settlement of note receivable	$ 0	$ 0	$ 386