Notes Payable - Schedule of Annual Repayment Requirements for Credit Facility (Details) - Amended Credit Facility $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Annual repayment requirements
Credit Facility, Principal	$ 18,000
Credit Facility, Interest and Final Payment	3,770
Credit Facility, Total	21,770
2017
Annual repayment requirements
Credit Facility, Interest and Final Payment	755
Credit Facility, Total	755
2018
Annual repayment requirements
Credit Facility, Principal	5,658
Credit Facility, Interest and Final Payment	1,308
Credit Facility, Total	6,966
2019
Annual repayment requirements
Credit Facility, Principal	6,171
Credit Facility, Interest and Final Payment	796
Credit Facility, Total	6,967
2020
Annual repayment requirements
Credit Facility, Principal	6,171
Credit Facility, Interest and Final Payment	911
Credit Facility, Total	$ 7,082