XML 70 R52.htm IDEA: XBRL DOCUMENT v3.20.2
Deferred Revenue - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Customer
Jun. 30, 2019
Customer
Jun. 30, 2020
USD ($)
Customer
Jun. 30, 2019
Customer
Deferred Revenue [Abstract]        
Revenue recognized | $ $ 0.4   $ 1.3  
Number of customer accounted for more than 10% of revenues | Customer 1 0 1 0