Quarterly report pursuant to Section 13 or 15(d)

Restricted Cash (Details)

v3.10.0.1
Restricted Cash (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Restricted Cash and Investments [Abstract]        
Cash and cash equivalents $ 13,554,099 $ 18,529,757    
Restricted cash 25,980 102,027    
Cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows $ 13,580,079 $ 18,631,784 $ 20,533,338 $ 20,772,689