Annual report pursuant to Section 13 and 15(d)

Short-term investments (Details)

v3.19.1
Short-term investments (Details) - Fair Value, Measurements, Recurring [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Amortized Cost $ 3,043
Carrying value 3,043
Mutual Fund [Member] | Available-for-sale Securities [Member]  
Amortized Cost 3,043
Carrying value $ 3,043