Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Schedule of Deferred Revenue (Details) (Parenthetical)

v3.19.1
Revenue Recognition - Schedule of Deferred Revenue (Details) (Parenthetical) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue from Contract with Customer [Abstract]    
Revenue recognized $ 2,500,000 $ 4,248,000