Private Placements (Details) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended
	Mar. 31, 2020	Mar. 06, 2020	Aug. 09, 2019	Mar. 28, 2019	Aug. 06, 2018	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Number of shares issued (in shares)					12,062,000
Common stock, par value (in dollars per share)	$ 0.001				$ 0.001	$ 0.001		$ 0.001
Number of additional shares from warrants (in shares)				2,500,000	4,221,700
Initial exercise price of warrants (in dollars per share)				$ 7.00	$ 2.52
Proceeds from the exercise of warrants				$ 10,600		$ 1,861	$ 10,639
Exercise of warrants (shares)						338,454
Preferred stock issued during the period						$ 25,000	$ 0
Series E Preferred Stock
Class of Stock [Line Items]
Issuance of shares (shares)		25,000	10,000
Preferred stock issued during the period		$ 25,000	$ 10,000
Dividend rate			9.00%
Redemption price, percent			110.00%
Base amount (in dollars per share)	$ 1,000		$ 1,000			$ 1,000		$ 1,000
Series E Preferred Stock | South Ocean Funding LLC
Class of Stock [Line Items]
Issuance of shares (shares)	2,330