Subsequent Events (Details) - USD ($)				12 Months Ended
	Feb. 20, 2019	Feb. 15, 2019	Nov. 13, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 15, 2018
Subsequent Event [Line Items]
Preferred stock, shares issued (shares)							200,000
Number of shares that may be purchased by warrants (shares)				60,000			60,000
Exercise price of right (usd per right)				$ 81.50	$ 30		$ 81.50
Series F Preferred Stock issuance				$ 11,880,000	$ 0	$ 0
Series F
Subsequent Event [Line Items]
Preferred stock, shares issued (shares)				0
2018 Kien Huat Preferred Stock Commitment Letter [Member] | Kien Huat Realty Limited [Member] | Subsequent Event
Subsequent Event [Line Items]
Issuance of Preferred Stock and Preference Stock, Funding Fee	$ 300,000
2018 Kien Huat Preferred Stock Commitment Letter [Member] | Series F | Kien Huat Realty Limited [Member]
Subsequent Event [Line Items]
Preferred stock, shares issued (shares)			120
Proceeds from Issuance of Preferred Stock and Preference Stock, Gross			$ 12,000,000
Issuance of Preferred Stock and Preference Stock, Funding Fee			120,000
Series F Preferred Stock issuance			$ 11,900,000
2018 Kien Huat Preferred Stock Commitment Letter [Member] | Series F | Kien Huat Realty Limited [Member] | Subsequent Event
Subsequent Event [Line Items]
Preferred stock, shares issued (shares)	200
Proceeds from Issuance of Preferred Stock and Preference Stock, Gross	$ 20,000,000
Issuance of Preferred Stock and Preference Stock, Funding Fee	200,000
Series F Preferred Stock issuance	$ 19,800,000
2019 Moelis Letter Agreement [Member] | Moelis & Company LLC [Member] | Subsequent Event
Subsequent Event [Line Items]
Professional and Contract Services Expense		$ 350,000