Notes Payable - (Details) - USD ($)		6 Months Ended
	Aug. 27, 2014	Jun. 30, 2018
Line of Credit Facility
Maximum borrowing capacity	$ 25,000,000
Total proceeds from issuance of promissory notes	$ 10,000,000
Credit Facility
Line of Credit Facility
Interest rate (as a percent)		7.49%
Percentage of amount outstanding due as a payment (as a percent)		3.48%
Effective interest rate (as a percent)		11.20%
Debt Instruments
Financial covenants		0
Final judgment amount that would trigger lender rights for remedy		$ 250,000
Basis spread		5.00%
Interest rate increase in the event of a default (as a percent)		5.00%
Minimum | Credit Facility
Line of Credit Facility
Percentage of amount outstanding due as a payment (as a percent)		1.00%
Maximum | Credit Facility
Line of Credit Facility
Percentage of amount outstanding due as a payment (as a percent)		3.00%