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Commitments and Contingencies (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Commitments and Contingencies |  |  |
Rent expense | $ 798,000 | $ 802,000 | $ 822,000
Future minimum lease payments, Operating leases |  |  |
2016 | 796,000 |  |
2017 | 754,000 |  |
2018 | 734,000 |  |
2019 | 756,000 |  |
2020 | 513,000 |  |
Total minimum payments | 3,553,000 |  |
Future minimum lease payments, Purchase commitments |  |  |
2016 | 1,305,000 |  |
2017 | 408,000 |  |
2018 | 378,000 |  |
Total minimum payments | 2,091,000 |  |
Future minimum lease payments, Total |  |  |
2016 | 2,101,000 |  |
2017 | 1,162,000 |  |
2018 | 1,112,000 |  |
2019 | 756,000 |  |
2020 | 513,000 |  |
Total minimum payments | $ 5,644,000 |  |

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