Annual report pursuant to Section 13 and 15(d)

Operating leases, Terms (Details)

v3.20.1
Operating leases, Terms (Details) - ASU 842 [Member] - Maximum [Member]
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Overstatement of Right of Use Asset [Member]  
Adoption of FASB ASC Topic 842 "Leases" [Abstract]  
Quantifying misstatement corrected in current period $ 0.1
Overstatement of Operating Lease Liabilities [Member]  
Adoption of FASB ASC Topic 842 "Leases" [Abstract]  
Quantifying misstatement corrected in current period 0.1
Overstatement of Accumulated Deficit [Member]  
Adoption of FASB ASC Topic 842 "Leases" [Abstract]  
Quantifying misstatement corrected in current period $ 0.1