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CONSOLIDATED STATEMENTS OF CASH FLOWS Non-Cash Activities - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Other Significant Noncash Transactions [Line Items]    
Unrealized (gain) loss on available-for-sale securities $ (117) $ 256
Net change in accounts payable and accrued expenses related to purchases of property and equipment 2,572 133
Earnout liability recorded for Adesis acquisition   1,510
Common Stock Issued to Board of Directors and Scientific Advisory Board that was Earned and Accrued for in Previous Period [Member]    
Other Significant Noncash Transactions [Line Items]    
Other significant noncash transaction, value of consideration received 300 300
Common Stock Issued to Employees that was Earned and Accrued for 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