Annual report pursuant to Section 13 and 15(d)

Revenue Recognition - Other (Details)

v3.20.4
Revenue Recognition - Other (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Contract Liabilities    
Deferred revenue $ 6,542 $ 16,139
Uncompleted Performance Obligations    
Amount remaining on uncompleted performance obligations $ 262,300  
Expected timing of satisfaction of performance obligations over the next 18 months  
Receivables, net    
Contract Assets    
Receivables, unbilled $ 48,839 57,153
Accrued liabilities    
Contract Liabilities    
Deferred revenue $ 6,542 $ 16,139