Annual report pursuant to Section 13 and 15(d)

Revenue Recognition (Narrative) (Details)

v3.21.1
Revenue Recognition (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Revenue Recognition [Abstract]    
Number of segments | segment 2  
Cost to obtain contracts $ 52,000 $ 0
Contract assets 267,000 $ 0
Contract liabilities $ 0