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Private Placements (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
May 12, 2020
Mar. 31, 2020
Mar. 06, 2020
Aug. 09, 2019
Mar. 28, 2019
Aug. 06, 2018
Jun. 30, 2020
Jun. 30, 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
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  
Preferred stock, par value (in dollars per share)             $ 0.001   0.001
Payments repurchase of preferred stock             $ 2,354 $ 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
Stock repurchased (in shares) 2,330                
Preferred stock, par value (in dollars per share)     $ 0.001       $ 0.001   $ 0.001
Payments repurchase of preferred stock $ 2,400                
Series E Preferred Stock | South Ocean Funding LLC                  
Class of Stock [Line Items]                  
Issuance of shares (shares)   2,330