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Commitments and Contingencies (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Leases [Abstract] |  |  |
Rent expenses under the operating leases | $ 313,000 | $ 260,000 | $ 638,000
Summary of total minimum lease payments [Abstract] |  |  |
2016 | 173,000 |  |
2017 | 167,000 |  |
2018 | 39,000 |  |
2019 | 30,000 |  |
2020 | 27,000 |  |
Thereafter | 97,000 |  |
Total | $ 533,000 |  |
Royalty Agreement [Abstract] |  |  |
Term of royalty agreement | 8 years |  |
Aggregate amount payable towards royalty | $ 7,000,000 |  |
Royalty expense | 583,000 | 577,000 | 530,000
Credit of royalty expense | 217,000 | $ 223,000 | $ 270,000
Summary of total royalty payments under the agreement[Abstract] |  |  |
2016 | 575,000 |  |
2017 | 575,000 |  |
2018 | 575,000 |  |
Total royalty payments | $ 1,725,000 |  |

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