Annual report pursuant to Section 13 and 15(d)

Notes Payable (Details)

v3.3.1.900
Notes Payable (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
USD ($)
item
Oct. 15, 2015
USD ($)
Sep. 19, 2014
USD ($)
Mar. 14, 2014
USD ($)
Dec. 19, 2013
USD ($)
$ / shares
shares
Oct. 15, 2013
USD ($)
Jun. 24, 2013
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Dec. 31, 2013
USD ($)
$ / shares
Oct. 23, 2013
item
Dec. 31, 2012
$ / shares
Notes Payable                          
Maturity Date Dec. 31, 2016 Mar. 31, 2016             Oct. 01, 2021        
Class Of Warrant Or Right Issued Number | shares           2,354,545              
Class Of Warrant Or Right, Exercise Price Of Warrants Or Rights | $ / shares           $ 1.35     $ 1.00 $ 1.20 $ 0.92   $ 0.82
Number of installments | item   4                      
Write off of Deferred Debt Issuance Cost                     $ 5,700    
Proceeds from debt financing                   $ 5,000 $ 75,100    
RMBAH First Loan Facility [Member]                          
Notes Payable                          
Proceeds from Issuance of Long-term Debt         $ 1,500     $ 20,000          
Fixed interest rate (as a percent)                 8.75%        
Proceeds From Lines Of Credit     $ 3,500 $ 3,500         $ 3,500        
Proceeds from debt financing           $ 5,000              
Periodic payment amount                 4,312        
Line of Credit Facility, Remaining Borrowing Capacity                 3,500        
Maximum Borrowing Capacity   $ 10,000           $ 20,000          
Sweetwater IDR Bond [Member]                          
Notes Payable                          
Proceeds from Issuance of Long-term Debt             $ 34,000            
Periodic payment amount                 $ 28,881        
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  
Due Quarterly Commencing From June Thirty Two Thousand Fourteen [Member] | RMBAH First Loan Facility [Member]                          
Notes Payable                          
Periodic payment amount       $ 810