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Commitments and Contingencies (Details) | Mar. 01, 2019 USD ($) | Dec. 03, 2018 USD ($) day | Apr. 19, 2018 USD ($)
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Severance restricted stock units, weighted average price, number of trading days | day |  | 20 |
Mr. Mould |  |  |
Severance benefits |  | $ 900,000 |
Severance benefits, period of consideration |  | 2 years |
Cash severance payment |  | $ 100,000 |
Restricted stock units awarded as part of severance |  | 21 months |
Common shares, volume weighted-average price | $ 33,333 |  |
Minimum |  |  |
Exercise period of stock options |  |  | 90 days
Maximum |  |  |
Exercise period of stock options |  |  | 2 years
Dr. Stephen Clarke | Employment Agreement |  |  |
Severance benefits |  |  | $ 900,000
Severance benefits, period of consideration |  |  | 2 years
Expense related to stock option awards |  |  | $ 15,000,000

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