CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net (loss) income	$ (35,107)	$ 21,127
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	1,063	1,581
Gains on sales of fixed assets	(307)	0
Expenses for share-based compensation awards	5,750	4,695
Changes in assets and liabilities:
Decrease (increase) in accounts receivable	387	(229)
(Increase) decrease in other current assets	(244)	986
Decrease in other assets	0	1,050
Increase (decrease) in accounts payable and accrued expenses	155	(2,802)
Increase in deferred revenue - current	0	204
(Decrease) increase in deferred revenue - long term	(153)	213
Decrease in other liabilities	(458)	(37)
Net cash (used in) provided by operating activities	(28,914)	26,788
Cash flows from investing activities:
Capital expenditures	(759)	(142)
Proceeds from sales of fixed assets	368	0
Proceeds from redemption of auction rate securities	100	200
Net cash (used in) provided by investing activities	(291)	58
Cash flows from financing activities:
Proceeds from the exercise of stock options and sale of common stock under employee stock purchase plans	196	3,234
Net cash provided by financing activities	196	3,234
Net (decrease) increase in cash and cash equivalents	(29,009)	30,080
Cash and cash equivalents at beginning of period	70,105	47,918
Cash and cash equivalents at end of period	$ 41,096	$ 77,998