Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) - USD ($)		12 Months Ended
	Feb. 07, 2019	Dec. 31, 2018	Dec. 31, 2017
Product Information [Line Items]
Increase in cash and cash equivalents		$ (613,314)	$ (2,671,268)
Subsequent Event
Product Information [Line Items]
Increase in cash and cash equivalents	$ 8,500
Subsequent Event | Maximum
Product Information [Line Items]
Russian Ruble : Dollar Exchange Rate	$ 65.6686
Outside of the U.S. | Geographic Concentration Risk | Cash and Cash Equivalents Located Outside the US
Product Information [Line Items]
Concentration risk percentage		4.00%