CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (15,466)us-gaap_NetIncomeLoss	$ (15,550)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used for operating activities from continuing operations:
Depreciation and amortization	385us-gaap_Depreciation	213us-gaap_Depreciation
Amortization of debt issuance costs and discounts	4,180	3,567
Amortization of discount or premium on available-for-sale securities	838	911
Share-based compensation expense	1,550us-gaap_ShareBasedCompensation	2,848us-gaap_ShareBasedCompensation
Unrealized foreign currency remeasurement gain		(68)
Changes in assets and liabilities:
Accounts receivable	(117)	(18,865)
Inventories	(1,483)us-gaap_IncreaseDecreaseInInventories	1,293us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	848	3,300
Accounts payable	(1,073)	(3,089)
Accrued and other liabilities	(31)	(26)
Deferred revenue	(1,053)	549
Net cash used for operating activities	(11,422)	(24,917)
Cash flows from investing activities:
Property and equipment purchases	(47)	(17)
Purchases of available-for-sale securities	(47,488)	(51,353)
Proceeds from maturities of available-for-sale securities	74,750	64,000
Non-current assets		(2,074)
Net cash used for investing activities	27,215	10,556
Cash flows from financing activities:
Payments of notes payable	(79)
Net proceeds from exercise of common stock options		758
Net cash (used for) provided by financing activities	(79)	758
Net change in cash and cash equivalents	15,714	(13,603)
Cash and cash equivalents:
Beginning of period	83,174	103,262
End of period	$ 98,888	$ 89,659

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