Fair value measurements (Narrative) (Details)
|3 Months Ended|
Jun. 30, 2019
|Fair Value Disclosures [Abstract]|
|Conversion of notes into shares||1,813,500|
The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef