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Statements Of Cash Flows (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Operating Activities:    
Net income (loss) $ (1,577,000) $ 53,873,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 283,000 88,000
Deferred income tax expense   5,385,000
Stock-based compensation expense 185,000 145,000
Changes in operating assets and liabilities:    
Accounts receivable 665,000 405,000
Inventories (38,000) (19,000)
Prepaid expenses and other (570,000) 54,000
Accounts payable (242,000) (183,000)
Accrued liabilities (927,000) (130,000)
Income tax payable (748,000) 28,145,000
Accrued income taxes   400,000
Excess tax benefit from stock options   (2,222,000)
Deferred revenue 164,000 25,000
Net cash provided by (used in) operating activities (2,805,000) 85,966,000
Investing Activities:    
Purchases of property and equipment (40,000) (41,000)
Acquisition of selling arrangement   (4,000,000)
Proceeds from sale of investments   500,000
Net cash used in investing activities (40,000) (3,541,000)
Financing Activities:    
Proceeds from issuance of common stock 131,000 3,069,000
Excess tax benefit from stock options   2,222,000
Repurchase of common stock, net (213,000) (10,672,000)
Net cash used in financing activities (82,000) (5,381,000)
Increase (decrease) in cash and cash equivalents (2,927,000) 77,044,000
Cash and cash equivalents at beginning of period 23,202,000 13,196,000
Cash and cash equivalents at end of period 20,275,000 90,240,000
Supplemental disclosures for cash flow information:    
Cash paid for income taxes 790,000 12,000
Non-cash investing and financing activities:    
Dividend payable   31,335,000
Cashless exercise of stock options   $ 800,000