Commitments and Contingencies - Future Minimum Rental Payments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
2017 (remaining)	$ 1,290,000
2018	1,604,000
2019	1,604,000
2020	1,604,000
2021	1,604,000
2022 and thereafter	34,613,000
Total	42,319,000
Other Expenses [Abstract]
Operating ground lease expense	$ 311,000	$ 256,000