v3.19.3
Revenue (Tables)
6 Months Ended
Jun. 30, 2019
Revenue Recognition and Deferred Revenue [Abstract]  
Schedule of disaggregation of revenue
Three Months Ended
June 30,
Six Months Ended
June 30,
2019201820192018
Automotive—  118,398  240,000  523,252  
Aviation—  —  —  —  
Other5,508  52,286  129,690  207,661  
Total revenues5,508  170,684  369,690  730,913