Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 30, 2020	Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Stock Issued During Period, Value, New Issues			$ 6,996	$ 8,363
Common stock
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues			1,282,904	577,195
Stock Issued During Period, Value, New Issues			$ 1	$ 1
ATM | Common stock
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues			1,282,904
Shares Issued, Price Per Share			$ 5.81
Stock Issued During Period, Value, New Issues			$ 7,500
Proceeds from Issuance of Common Stock			$ 7,000
ATM | Subsequent Events
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues		173,572
Shares Issued, Price Per Share		$ 6.29
Stock Issued During Period, Value, New Issues		$ 1,100
January 2020 Financing | Oppenheimer & Co. Inc | Common stock
Subsequent Event [Line Items]
Shares Issued, Price Per Share	$ 5.00
Stock Issued During Period, Value, New Issues	$ 26,500
January 2020 Financing | Subsequent Events | Oppenheimer & Co. Inc | Common stock
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues	5,290,000
Proceeds from Issuance of Common Stock	$ 24,500
Over-Allotment option for underwriters | Subsequent Events | Oppenheimer & Co. Inc | Common stock
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues	690,000