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Transactions with Olympus Corporation (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2015 | May. 27, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 08, 2013
Acquisition of Olympus' Interest in the Joint Venture [Abstract] |  |  |  |  |  |
Remeasurement gain |  |  | $ 0 | $ 0 | $ 4,892,000 |
Inputs used in valuation of acquired intangible assets [Abstract] |  |  |  |  |  |
Useful life |  |  | 7 years |  |  |
Total purchase price | $ 6,000,000 |  |  |  |  |
Purchase price payment agreement term |  |  | 2 years |  |  |
Amendment One to Joint Venture Termination Agreement [Member] |  |  |  |  |  |
Inputs used in valuation of acquired intangible assets [Abstract] |  |  |  |  |  |
Purchase price remaining balance | $ 3,200,000 |  |  |  |  |
Interest rate on the purchase price of remaining balance | 6.00% |  |  |  |  |
Purchase price principal amount payable on May 8, 2015 | $ 1,000,000 |  |  |  |  |
Purchase price principal amount payable on September 30, 2015 | 500,000 |  |  |  |  |
Purchase price principal amount payable in early January 2016 | 500,000 |  |  |  |  |
Purchase price principal amount payable on March 31, 2016 | 500,000 |  |  |  |  |
Purchase price principal amount and accrued interest payable on May 8, 2016 | $ 700,000 |  |  |  |  |
Acquired Olympus Ownership [Member] |  |  |  |  |  |
Acquisition of Olympus' Interest in the Joint Venture [Abstract] |  |  |  |  |  |
Equity interest acquired |  | 50.00% |  |  |  |
Acquisition agreement date |  | May 27, 2013 |  |  |  |
Remeasurement gain |  |  |  |  | $ 4,892,000 |
Inputs used in valuation of acquired intangible assets [Abstract] |  |  |  |  |  |
Estimated fair value |  |  |  |  |  | $ 9,394,000
Fair value of purchase consideration |  | $ 4,928,000 |  |  |  |
Unamortized discount resulting from fair value calculation of purchase obligations |  | $ 1,072,000 |  |  |  |
Weighted average expected term for amortization of purchase obligation |  | 1 year 9 months 18 days |  |  |  |
Extended purchase price amount in default prior to March 1, 2020 |  |  | $ 16,000,000 |  |  |
Fair value of the assets acquired and liabilities assumed at the date of acquisition [Abstract] |  |  |  |  |  |
Current assets |  |  |  |  |  | 236,000
Property and equipment |  |  |  |  |  | 260,000
Intangible assets |  |  |  |  |  | 9,394,000
Total assets acquired |  |  |  |  |  | 9,890,000
Accrued and other current liabilities |  |  |  |  |  | (33,000)
Total fair value of the Joint Venture |  |  |  |  |  | $ 9,857,000
Acquired Olympus Ownership [Member] | Minimum [Member] |  |  |  |  |  |
Inputs used in valuation of acquired intangible assets [Abstract] |  |  |  |  |  |
Discount rate used to value intangible assets |  | 9.75% |  |  |  |
Acquired Olympus Ownership [Member] | Maximum [Member] |  |  |  |  |  |
Inputs used in valuation of acquired intangible assets [Abstract] |  |  |  |  |  |
Discount rate used to value intangible assets |  | 12.75% |  |  |  |
Acquired Olympus Ownership [Member] | Developed Technology [Member] |  |  |  |  |  |
Inputs used in valuation of acquired intangible assets [Abstract] |  |  |  |  |  |
Useful life |  |  | 7 years |  |  |
Estimated fair value |  |  | $ 9,394,000 |  |  |
Fair value of the assets acquired and liabilities assumed at the date of acquisition [Abstract] |  |  |  |  |  |
Intangible assets |  |  | $ 9,394,000 |  |  |

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