Quarterly report pursuant to Section 13 or 15(d)

Public Stock Offering (Details Textual)

v3.19.3
Public Stock Offering (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Feb. 06, 2018
Sep. 28, 2019
Sep. 29, 2018
Subsidiary Sale Of Stock [Line Items]      
Proceeds from stock issued   $ 1,252 $ 240,959
Common stock [Member]      
Subsidiary Sale Of Stock [Line Items]      
Sale of stock     4,400,000
Common stock [Member] | Public Offering [Member]      
Subsidiary Sale Of Stock [Line Items]      
Sale of stock 4,400,000    
Shares price per share $ 57.50    
Proceeds from stock issued $ 239,793