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CONSOLIDATED STATEMENTS OF CASH FLOWS Non-Cash Activities - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Other Significant Noncash Transactions [Line Items] |  |
Unrealized (loss) gain on available-for-sale securities | $ (233) | $ 22
Common Stock Issued To Board Of Directors And Scientific Advisory Board That Was Earned 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 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 | 1,105 | 967
Other Capitalized Property Plant and Equipment [Member] |  |
Other Significant Noncash Transactions [Line Items] |  |
Net change in accounts payable and accrued expenses related to purchases of property and equipment | $ 343 | $ (686)

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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=27724398&loc=d3e27357-111563 + Details
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- Definition The value of the noncash (or part noncash) consideration received in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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