Annual report pursuant to Section 13 and 15(d)

Notes Payable (Details)

v3.6.0.2
Notes Payable (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 14, 2014
USD ($)
Oct. 15, 2013
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Dec. 31, 2015
$ / shares
Jan. 31, 2015
item
Dec. 31, 2013
$ / shares
Notes Payable              
Proceeds from Issuance of Long-term Debt   $ 34,000          
Fixed interest rate (as a percent)             5.75%
Effective Interest Rate     9.13%        
Maturity Date     Dec. 29, 2016        
Class Of Warrant Or Right, Exercise Price Of Warrants Or Rights | $ / shares     $ 1.02 $ 1.20 $ 1.71   $ 0.95
Number of installments | item           28  
Proceeds from debt financing $ 3,500     $ 5,000      
Sweetwater IDR Bond [Member]              
Notes Payable              
Maturity Date     Oct. 01, 2021        
Periodic payment amount     $ 24,514