Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Summary of Assets and Liabilities Measured at Fair Value Recurring and Nonrecurring Basis (Details)

v3.19.2
Fair Value Measurement - Summary of Assets and Liabilities Measured at Fair Value Recurring and Nonrecurring Basis (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Alternative fuel credits $ 357,366 $ 331,120
Marketable securities 3,032,386 2,878,664
Total assets 3,389,752 3,209,784
Warrants payable 8,706 5,965
Total liabilities 8,706 5,965
Level 1 [Member]    
Alternative fuel credits 357,366 331,120
Marketable securities 3,032,386 2,878,664
Total assets 3,389,752 3,209,784
Warrants payable
Total liabilities
Level 2 [Member]    
Alternative fuel credits
Marketable securities
Total assets
Warrants payable
Total liabilities
Level 3 [Member]    
Alternative fuel credits
Marketable securities
Total assets
Warrants payable 8,706 5,965
Total liabilities $ 8,706 $ 5,965