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Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Oct. 07, 2016
Aug. 02, 2016
Nov. 09, 2015
Nov. 05, 2015
Nov. 05, 2015
Nov. 04, 2015
Jan. 05, 2015
Sep. 22, 2014
Aug. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Nov. 20, 2014
May 29, 2014
Class of Warrant or Right [Line Items]                            
Additional shares of common stock exercised to purchase (in shares)                   2,000 0      
Net proceeds from offering     $ 54,700             $ 0 $ 53,975 $ 6,000    
Total number of shares sold (in shares)                   42,070,675 35,281,375      
Conversion of preferred stock to common stock                   $ 21,372 $ 1,839      
Schuff                            
Class of Warrant or Right [Line Items]                            
Total number of shares sold (in shares)                           1,500,000
Preferred stock cumulative cash dividend rate (as a percent)             7.50%              
Preferred stock dividend rate (as a percent)             4.00%              
Volume weighted average price threshold percentage             150.00%              
Preferred stock redemption price per share on accrued and unpaid dividends, percentage                 150.00%          
Preferred stock force conversion, trading days to calculate volume weighted average price                 30 days          
Convertible preferred stock volume weighted average price percentage                 150.00%          
Preferred stock trading days to calculate volume weighted average price                 20 days          
Schuff | Maximum                            
Class of Warrant or Right [Line Items]                            
Preferred stock dividend rate (as a percent)             2.00%              
Schuff | Minimum                            
Class of Warrant or Right [Line Items]                            
Preferred stock dividend rate (as a percent)             0.00%              
Senior Secured Notes Collateralized by Assets                            
Class of Warrant or Right [Line Items]                            
Additional notes issued (as a percent)                 11.00%       11.00%  
Common stocks                            
Class of Warrant or Right [Line Items]                            
Conversion of preferred stock to common stock                   $ 700        
Series A Preferred Stock                            
Class of Warrant or Right [Line Items]                            
Payment of the purchase price                 $ 5,000          
Number of shares of preferred stock converted (in shares)                   14,364        
Number of shares of common stock from conversion (in shares)                   4,196,388        
Series A Preferred Stock | Schuff                            
Class of Warrant or Right [Line Items]                            
Preferred stock, shares issued (in shares)                           30,000
Series A-1 Convertible Preferred Stock                            
Class of Warrant or Right [Line Items]                            
Number of shares of preferred stock converted (in shares)                   9,000 1,000      
Number of shares of common stock from conversion (in shares)                   2,119,764        
Series A-1 Convertible Preferred Stock | Minimum                            
Class of Warrant or Right [Line Items]                            
Intrinsic value (in usd per share)             $ 4.25              
Series A-1 Convertible Preferred Stock | Schuff                            
Class of Warrant or Right [Line Items]                            
Preferred stock, shares issued (in shares)               11,000            
Preferred stock conversion price (in usd per share)               $ 4.25            
Series A-2 Preferred Stock | Schuff                            
Class of Warrant or Right [Line Items]                            
Preferred stock, shares issued (in shares)             14,000              
Preferred stock conversion price (in usd per share)             $ 7.80              
Common stocks                            
Class of Warrant or Right [Line Items]                            
Issuance and sale of common stock (in shares)         8,452,500 8,452,500         8,459,000 1,500,000    
Additional shares of common stock exercised to purchase (in shares)       1,102,500                    
Conversion of preferred stock to common stock                   $ 7        
Common stocks | Series A-1 Convertible Preferred Stock                            
Class of Warrant or Right [Line Items]                            
Number of shares of common stock from conversion (in shares)                     235,526      
Common stocks | November 2015 Offering                            
Class of Warrant or Right [Line Items]                            
Issuance and sale of common stock (in shares)           7,350,000                
Corrib Master Fund, Ltd. | Common stocks                            
Class of Warrant or Right [Line Items]                            
Issuance and sale of common stock (in shares)   15,318                        
Number of shares of common stock from conversion (in shares)   238,492                        
Corrib Master Fund, Ltd. | Series A Preferred Stock                            
Class of Warrant or Right [Line Items]                            
Issuance and sale of common stock (in shares)   1,000                        
Number of shares of preferred stock converted (in shares)   1,000                        
Luxor Capital Partners, LP | Common stocks                            
Class of Warrant or Right [Line Items]                            
Issuance and sale of common stock (in shares)   136,149                        
Number of shares of common stock from conversion (in shares)   2,119,765                        
Luxor Capital Partners, LP | Series A-1 Preferred Stock [Member]                            
Class of Warrant or Right [Line Items]                            
Issuance and sale of common stock (in shares)   9,000                        
Number of shares of preferred stock converted (in shares)   9,000                        
Corrib Master Fund, Ltd. and Luxor Capital Partners, LP                            
Class of Warrant or Right [Line Items]                            
Percent of accrued value                   1.875%        
Hudson Bay Absolute Return Credit Opportunities Master Fund, LTD. | Common stocks                            
Class of Warrant or Right [Line Items]                            
Number of shares of common stock from conversion (in shares)                   770,926        
Additional share consideration valued at                   $ 4,400        
Number of shares converted (in shares) 3,751,838                          
Hudson Bay Absolute Return Credit Opportunities Master Fund, LTD. | Series A Preferred Stock                            
Class of Warrant or Right [Line Items]                            
Number of shares of preferred stock converted (in shares) 12,500                 12,499        
Number of shares of common stock from conversion (in shares)                   2,980,912        
Recurring | Level 3                            
Class of Warrant or Right [Line Items]                            
Additional share consideration valued at                   $ 1,500