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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Statement of Cash Flows [Abstract]    
Net income $ 24,443 $ 10,624
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of deferred revenue (1,669) (1,835)
Depreciation 937 985
Amortization of intangibles 5,498 5,483
Amortization of premium and discount on investments, net (269) (219)
Stock-based compensation to employees 3,526 2,935
Stock-based compensation to Board of Directors and Scientific Advisory Board 463 394
Deferred income tax benefit 6,833 0
Retirement plan benefit expense 838 834
(Increase) decrease in assets:    
Accounts receivable (4,843) (5,794)
Inventory (10,069) 2,345
Other current assets (6,451) (2,313)
Other assets (252) 2
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses 1,914 (186)
Other current liabilities 417 904
Deferred revenue 3,692 1,376
Net cash provided by operating activities 25,008 15,535
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (2,951) (2,435)
Additions to intangibles 0 (107)
Purchases of investments (183,688) (185,314)
Proceeds from sale of investments 175,603 175,093
Net cash used in investing activities (11,036) (12,763)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from issuance of common stock under ESPP 162 177
Repurchase of common stock (7,000) (5,456)
Proceeds from the exercise of common stock options 664 271
Payment of withholding taxes related to stock-based compensation to employees (2,830) (2,985)
Net cash used in financing activities (9,004) (7,993)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 4,968 (5,221)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 70,586 85,923
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 75,554 $ 80,702