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Other Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Other Assets, Noncurrent Disclosure [Abstract] |  |  |
Demonstration assets, net | $ 2,472 |  | $ 2,598
Deferred tax assets, net | 66 |  | 69
Other | 2,500 |  | 2,500
Other assets | $ 5,038 |  | $ 5,167
Useful life of demonstration assets | 2 years |  |
Amortization expense | $ 541 | $ 504 |

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