Quarterly report pursuant to Section 13 or 15(d)

Revenue Contract Assets and Liabilities (Details)

v3.19.2
Revenue Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Contract with customer, performance obligation satisfied in previous period $ 0 $ 0  
Contract assets   1,495 $ 485
Contract with customer, liability   $ 9,900 $ 11,300