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CONSOLIDATED STATEMENTS OF CASH FLOWS Non-Cash Activities - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Significant Noncash Transactions [Line Items]      
Unrealized loss on available-for-sale securities $ (19) $ (207) $ (129)
Net change in accruals for purchases of property and equipment 4,363 (103) 467
Earnout liability recorded for Adesis acquisition   1,670  
Excess tax benefits accrued in other current liabilities   (4,232)  
Cash paid for income tax 23,248 12,870 10,364
Common Stock Issued to the Board of Directors and Scientific Advisory Board Earned and Accrued in Previous Period [Member]      
Other Significant Noncash Transactions [Line Items]      
Other significant noncash transaction, value of consideration received 300 300 300
Common Stock Issued to Employees Earned and Accrued in Previous Period Net of Shares Withheld for Taxes [Member]      
Other Significant Noncash Transactions [Line Items]      
Other significant noncash transaction, value of consideration received $ 174 $ 1,105 $ 967