Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accumulated other comprehensive income (loss) (Details)

v3.8.0.1
Summary of Significant Accounting Policies - Accumulated other comprehensive income (loss) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Other income , net  
Reclassification adjustment for losses on available-for-sale debt securities $ 646