Commitments and Contingencies - Future Minimum Principal Payments (Details)	Mar. 31, 2018 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2018	$ 11,250,000
2019	15,000,000
2020	26,250,000
Total minimum loan payments	52,500,000
Interest payments due in 2019	100,000
Interest payments due in 2020	100,000
Interest Rate Cap
Long-term Debt, Fiscal Year Maturity [Abstract]
Remaining notional amount	37,500,000
At inception notional	$ 15,000,000