CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net (loss) income	$ (23,806)	$ 32,559
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	772	1,061
Gains on sales of fixed assets	(217)	0
Expenses for share-based compensation awards	4,796	3,273
Changes in assets and liabilities:
Increase in accounts receivable	(580)	(3,176)
(Increase) decrease in other current assets	(106)	656
Decrease in other assets	0	1,050
Decrease in accounts payable and accrued expenses	(2,348)	(3,640)
Increase in deferred revenue - current	0	204
(Decrease) increase in deferred revenue - long term	(102)	264
Decrease in other liabilities	(498)	(91)
Net cash (used in) provided by operating activities	(22,089)	32,160
Cash flows from investing activities:
Capital expenditures	(731)	(92)
Proceeds from sales of fixed assets	263	0
Proceeds from redemption of auction rate securities	100	100
Net cash (used in) provided by investing activities	(368)	8
Cash flows from financing activities:
Proceeds from the exercise of stock options and sale of common stock under employee stock purchase plans	172	2,319
Net cash provided by financing activities	172	2,319
Net (decrease) increase in cash and cash equivalents	(22,285)	34,487
Cash and cash equivalents at beginning of period	70,105	47,918
Cash and cash equivalents at end of period	$ 47,820	$ 82,405