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CONSOLIDATED STATEMENTS OF CASH FLOWS Non-Cash Activities - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Other Significant Noncash Transactions [Line Items] |  |
Unrealized loss on available-for-sale securities | $ (23) | $ (233)
Net change in accounts payable and accrued expenses related to purchases of property and equipment | 1,928 | 343
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

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- Definition This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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