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Commitments and Contingencies - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 03, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies |  |  |  |  |
Lease term |  |  | 22 months |  |
Termination fee |  | $ 270,000 |  |  |
Rent expenses |  |  | $ 212,000 | $ 470,000 | $ 783,000
Commission paid |  |  | 450,000 |  |
Commissions expense |  |  | $ 250,000 |  |
Cyren Inc - New Lessor |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Lease term | 36 months |  |  |  |
Monthly rent and common-area costs | $ 22,000 |  |  |  |
M West Propco - Old Lessor |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Termination fee | $ 250,000 |  |  |  |

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