CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net loss	$ (12,270)	$ (17,979)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	598	744
Amortization of premium/discount on marketable securities	570	522
Amortization of deferred gain on sale leaseback	(277)	(277)
Non-cash stock compensation	2,301	1,906
Loss on auction rate securities put option		5,074
Gain on auction rate securities	(47)	(4,459)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(4,497)	993
Other long-term assets	(24)	(5)
Accounts payable and accrued expenses	9,362	2,107
Deferred revenue	(1,103)	(9,622)
Net cash used in operating activities	(5,387)	(20,996)
Cash flows from investing activities:
Purchases of marketable securities	(95,131)	(36,821)
Proceeds from sale or maturity of marketable securities	57,660	76,998
Purchases of property and equipment	(324)	(144)
Net cash provided by (used in) investing activities	(37,795)	40,033
Cash flows from financing activities:
Payment of notes payable		(29,900)
Proceeds from stock offering, net	46,761
Proceeds from stock option exercises	3,808	460
Net cash provided by (used in) financing activities	50,569	(29,440)
Net increase (decrease) in cash and cash equivalents	7,387	(10,403)
Cash and cash equivalents, beginning of period	20,457	36,551
Cash and cash equivalents, end of period	$ 27,844	$ 26,148

This element represents the amortization of deferred gain on sale leaseback incurred by the lessee and amortized over the term of the lease.

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The increase (decrease), resulting in a gain (loss), in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.

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The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate caption: Noncash Interest Expense.

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The net cash inflow or outflow from financing activity for the period.

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The net cash inflow or outflow from investing activity.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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The cash outflow from purchases of trading, available-for-sale securities and held-to-maturity securities.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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