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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 16,166 $ 4,275
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of deferred revenue (3,282) (2,685)
Depreciation 1,493 1,449
Amortization of intangibles 8,224 2,126
Amortization of premium and discount on investments, net (336) (612)
Stock-based employee compensation 4,514 3,111
Stock-based compensation to Board of Directors and Scientific Advisory Board 597 648
Retirement plan benefit expense 1,250 1,165
(Increase) decrease in assets:    
Accounts receivable (9,128) 2,856
Inventory 3,166 (5,608)
Other current assets (2,458) (2,745)
Other assets (5) 37
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses 265 1,538
Other current liabilities (21) (3)
Deferred revenue 2,131 1,627
Net cash provided by operating activities 22,576 7,179
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (4,200) (2,278)
Additions to intangibles   (109,102)
Purchase of investments (284,581) (209,244)
Proceeds from sale of investments 255,022 278,412
Net cash used in investing activities (34,126) (42,212)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from the issuance of common stock 268 244
Repurchase of common stock (5,456) 0
Proceeds from the exercise of common stock options 890 1,323
Payment of withholding taxes related to stock-based employee compensation (2,990) (4,136)
Net cash used in financing activities (7,288) (2,569)
DECREASE IN CASH AND CASH EQUIVALENTS (18,838) (37,602)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 85,923 111,795
CASH AND CASH EQUIVALENTS, END OF PERIOD 67,085 74,193
The following non-cash activities occurred:    
Unrealized loss on available-for-sale securities (19) (16)
Common stock issued to Board of Directors and Scientific Advisory Board that was earned in a previous period 300 328
Common stock issued to employees that was accrued for in a previous period, net of shares withheld for taxes 282 252
Property and equipment purchases included in accounts payable $ 184 $ 0