Registration statement for securities of certain foreign private issuers

Share-Based Payment Transactions (Details)

v3.19.1
Share-Based Payment Transactions (Details) - USD ($)
$ in Thousands
 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]              
General and administrative expenses $ 2,638 $ 2,436 $ 4,056 $ 3,517 $ 5,106 $ 6,115 $ 3,904
Share-based payment arrangements [Member]              
Statement Line Items [Line Items]              
Research and development expenses         139 129 53
General and administrative expenses         53 180 56
Share-based payments         $ 192 $ 309 $ 109