Quarterly report pursuant to Section 13 or 15(d)

Notes Payable (Details)

v3.4.0.3
Notes Payable (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 15, 2015
USD ($)
Oct. 15, 2013
USD ($)
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
$ / shares
Mar. 14, 2014
USD ($)
Oct. 23, 2013
item
Notes Payable                
Fixed interest rate (as a percent)         8.75%      
Class Of Warrant Or Right, Exercise Price Of Warrants Or Rights | $ / shares     $ 1.06     $ 1.71    
Proceeds From Lines Of Credit $ 3,500              
Repayments of Debt         $ 3,500      
Maximum Borrowing Capacity             $ 3,500  
RMBAH First Loan Facility [Member]                
Notes Payable                
Periodic payment amount     $ 3,234          
Sweetwater IDR Bond [Member]                
Notes Payable                
Proceeds from Issuance of Long-term Debt   $ 34,000            
Periodic payment amount     $ 27,766 $ 5,487        
Due Quarterly Commencing From January One Two Thousand Fourteen [Member] | Sweetwater IDR Bond [Member]                
Notes Payable                
Fixed interest rate (as a percent)               5.75%
Due Quarterly Commencing From January One Two Thousand Fifteen [Member] | Sweetwater IDR Bond [Member]                
Notes Payable                
Number of installments | item               28