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Transactions with Olympus Corporation (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 30, 2015 | Dec. 31, 2017
Termination of Olympus' Interest in the Joint Venture [Abstract] |  |
Total purchase price | $ 6,000,000 |
Purchase price payment agreement term |  | 2 years
Amendment One to Joint Venture Termination Agreement [Member] |  |
Termination of Olympus' Interest in the Joint Venture [Abstract] |  |
Purchase price payment termination agreement total | 4,200,000 |
Purchase price principal amount payable on January 31, 2016 | 500,000 |
Purchase price principal amount payable on April 30, 2016 | 500,000 |
Purchase price principal amount and accrued interest payable on May 8, 2016 | $ 800,000 |
Purchase price payable obligations outstanding balance. |  | $ 0

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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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