Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Mar. 12, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 24, 2018	Jan. 23, 2018
Subsequent Event [Line Items]
Offering costs		$ 275	$ 268
Preferred stock par value (in USD per share)				$ 0.001	$ 0
Series X preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Number of shares converted (in shares)	0
Preferred stock par value (in USD per share)	$ 10,000
Shares issued upon conversion of share (in shares)	10,000
Maximum ownership upon conversion	9.99%
Rights Offering | Subsequent Event
Subsequent Event [Line Items]
Proceeds from common stock offering	$ 60,000
Offering costs	$ 700
Rights Offering | Common Stock | Subsequent Event
Subsequent Event [Line Items]
Sale of stock (in shares)	15,700,000
Rights Offering | Series X preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Sale of stock (in shares)	4,429
Shares available for future conversion (in shares)	44,300,000