Commitments and Contingencies - Public Offering and Controlled Equity Offering and Database Usage (Details) - USD ($)		6 Months Ended
	Jan. 25, 2013	Jun. 30, 2017	Mar. 15, 2017
Other Commitments [Line Items]
Proceeds from public offering		$ 100,000
Public Offering And Controlled Equity Offering | Selling Agents [Member]
Other Commitments [Line Items]
Commission on gross proceeds	3.00%
Public Offering And Controlled Equity Offering | Maximum [Member]
Other Commitments [Line Items]
Aggregate initial offering price			$ 20,698,357
Public Offering And Controlled Equity Offering | Maximum [Member] | Selling Agents [Member]
Other Commitments [Line Items]
Aggregate initial offering price	$ 30,000,000