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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 10,365 $ 1,949
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of deferred revenue (2,690) (2,032)
Depreciation 1,210 902
Amortization of intangibles 5,492 2,750
Amortization of premium and discount on investments, net (562) (297)
Stock-based compensation to employees 3,141 2,830
Stock-based compensation to Board of Directors and Scientific Advisory Board 709 408
Earnout liability recorded for Adesis acquisition 294  
Deferred income tax (benefit) expense 1,049 (169)
Retirement plan expense 1,005 1,029
Decrease (increase) in assets:    
Accounts receivable (11,327) 3,863
Inventory 646 (1,961)
Other current assets 616 (2,296)
Other assets 92 (472)
Increase (decrease) in liabilities:    
Accounts payable and accrued expenses (8,283) (9,134)
Other current liabilities (219) 590
Deferred revenue 106 2,250
Net cash provided by operating activities 1,644 210
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (631) (516)
Purchases of investments (170,136) (193,929)
Proceeds from sale of investments 130,647 208,571
Net cash (used in) provided by investing activities (40,120) 14,126
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 159 99
Proceeds from the exercise of common stock options 24 151
Payment of withholding taxes related to stock-based compensation to employees (3,541) (2,008)
Cash dividends paid (1,414)  
Net cash used in financing activities (4,772) (1,758)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (43,248) 12,578
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 139,365 97,513
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 96,117 $ 110,091