v3.19.2
Net Loss Per Share (Details Textual)
6 Months Ended
Jun. 30, 2019
shares
Class B common stock [Member]  
Net Loss Per Share (Textual)  
Antidilutive weighted-average shares 5,988,485
Class C common stock [Member]  
Net Loss Per Share (Textual)  
Antidilutive weighted-average shares 77,791,218
Stock options [Member]  
Net Loss Per Share (Textual)  
Antidilutive weighted-average shares 166,827