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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 39,591,000 $ 71,072,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of deferred revenue and recognition of unbilled receivables (52,325,000) (7,206,000)
Depreciation 6,094,000 3,638,000
Amortization of intangibles 16,479,000 16,485,000
Inventory write-down 1,045,000 0
Amortization of premium and discount on investments, net (4,191,000) (2,055,000)
Stock-based compensation to employees 9,697,000 8,467,000
Stock-based compensation to Board of Directors and Scientific Advisory Board 3,234,000 1,890,000
Earnout liability recorded for Adesis acquisition   509,000
Deferred income tax expense 15,820,000 6,804,000
Retirement plan expense 3,378,000 3,214,000
Decrease (increase) in assets:    
Accounts receivable 9,148,000 (18,262,000)
Inventory (33,811,000) (15,419,000)
Other current assets (116,000) (2,835,000)
Other assets (37,769,000) (40,000)
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses 439,000 3,904,000
Other current liabilities (34,000) (768,000)
Deferred revenue 99,940,000 1,863,000
Other liabilities 18,337,000  
Net cash provided by operating activities 94,956,000 71,261,000
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (20,925,000) (23,221,000)
Purchases of investments (500,985,000) (456,264,000)
Proceeds from sale of investments 415,697,000 351,024,000
Net cash used in investing activities (106,213,000) (128,461,000)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 616,000 529,000
Repurchase of common stock (477,000)  
Proceeds from the exercise of common stock options   29,000
Payment of withholding taxes related to stock-based compensation to employees (11,598,000) (9,330,000)
Cash dividends paid (8,486,000) (4,240,000)
Net cash used in financing activities (19,945,000) (13,012,000)
DECREASE IN CASH AND CASH EQUIVALENTS (31,202,000) (70,212,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 132,840,000 139,365,000
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 101,638,000 $ 69,153,000