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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended 32 Months Ended 38 Months Ended
Dec. 05, 2012
USD ($)
$ / shares
shares
May 01, 2012
USD ($)
$ / shares
shares
Jan. 31, 2013
$ / shares
shares
Dec. 31, 2016
USD ($)
item
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
item
shares
Stockholders' equity                
Gross cash proceeds from sale of common stock in a follow-on offering       $ 2,052 $ 1,867 $ 571    
7.50% Convertible Senior Secured Notes due 2019                
Stockholders' equity                
Shares of common stock issued in conversion of Notes | shares       700,000 5,200,000     16,120,128
Principal amount of the Notes converted       $ 3,962 $ 27,500   $ 81,463 $ 85,400
Shares of common stock issued in settlement of the interest make-whole provision | shares       24,000 500,000     2,219,908
Common Stock                
Stockholders' equity                
Number of votes to which holders of common shares are entitled for each share held | item       1       1
Number of shares sold | shares 6,000,000 10,000,000            
Selling price (in dollars per share) | $ / shares $ 8 $ 5 $ 8          
Expenses incurred in connection with offering $ 3,300 $ 4,700            
Exercise of over allotment from secondary offering (in shares) | shares   449,250 239,432          
Gross proceeds from issuance of common stock   $ 52,300            
Net cash proceeds from sale of common stock   $ 47,600            
Gross cash proceeds from sale of common stock in a follow-on offering 49,900              
Net cash proceeds from sale of common stock in a follow-on offering $ 46,600