Stock based compensation (Details) - 2017 Plan |
3 Months Ended |
|---|---|
|
Jun. 30, 2018
shares
| |
| Share based payments | |
| Total number of common shares authorized to issue | 2,659,885 |
| Number of shares available for grant | 149,567 |
| Exercise price for persons holding more than ten percent of voting power (as a percent) | 110.00% |
| Expiration period for persons holding more than ten percent of voting power | 10 years |
| Share based payment award expiration period | 10 years |
| Share based payment award vesting period | 4 years |
| Maximum | |
| Share based payments | |
| Exercise price for persons holding ten percent of voting power (as a percent) | 100.00% |
| Expiration period for persons holding ten percent of voting power | 5 years |