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Long-term Debt (Detail)
 2 Months Ended 6 Months Ended 12 Months Ended
Jul. 10, 2017
May 01, 2017
$ / shares
shares
Apr. 01, 2017
USD ($)
$ / shares
Dec. 14, 2016
USD ($)
Price
Days
$ / shares
Aug. 22, 2016
USD ($)
$ / shares
Jul. 13, 2016
$ / shares
shares
May 10, 2016
USD ($)
$ / shares
shares
Jan. 12, 2016
USD ($)
$ / shares
shares
May 08, 2013
USD ($)
$ / shares
shares
Feb. 28, 2017
USD ($)
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Aug. 07, 2017
Mar. 15, 2017
USD ($)
Jul. 29, 2016
$ / shares
Jun. 29, 2016
$ / shares
shares
Debt Instrument [Line Items]                                    
Loan, amount                 $ 10,000,000   $ 19,100,000              
Term for interest only payments                 12 months                  
Fixed coupon rate                 8.45%                  
Term for principal and interest payments                 30 months                  
Cash facility fee percentage                 1.00%                  
Cash final payment percentage                 5.50%                  
Warrant term                 7 years     5 years            
Number of shares availabe from warrants | shares                 9,109                  
Exercise price | $ / shares           $ 13.00 $ 30.20 $ 28.40 $ 49.4   $ 79.40 $ 79.40 $ 79.40       $ 8.60  
Debt instrument, covenant, compensating cash balance                     $ 13,200,000              
Warrants outstanding, shares | shares                     19,557,000 2,570,000 1,116,000 428,000        
Senior notes                       $ 17,621,702       $ 13,671,702    
Senior notes, current                       16,397,030            
Unamortized discount and debt issuance costs                     $ 146,552 1,224,672            
Issuance of common stock, value               $ 21,800,000   $ 3,950,000   $ 33,534,000 $ 47,416,000 $ 10,705,000        
Issuance of common stock, shares | shares               988,636   3,541,077                
Placement agent fee percentage             2.00%                      
Duration of average market price used for warrant exercise price                 20 days                  
Common stock, shares outstanding | shares   37,435,524                 37,435,524 15,190,473 8,095,337          
Common stock, shares issued | shares                     37,469,274 15,224,223 8,129,087          
Outstanding principle                     $ 13,171,702 $ 17,621,702            
Current portion of long-term debt                     13,025,180 16,397,030 $ 4,739,000          
Principle redeemed                     $ 4,450,000              
Shares issued for debt, shares | shares                     4,497,466              
Common Stock                                    
Debt Instrument [Line Items]                                    
Issuance of common stock, value                       $ 0 $ 3,000 $ 1,000        
Issuance of common stock, shares | shares           1,400,000           2,872,803 1,607,934 331,650        
Secured Debt | Securities Purchase Agreement                                    
Debt Instrument [Line Items]                                    
Term for interest only payments       6 months                            
Number of shares availabe from warrants | shares             100,000                      
Exercise price | $ / shares             $ 0.0001                      
Original issue discount, percent             6.375%                      
Principle amount of debt             $ 25,530,000                      
Proceeds from issuance of debt and warrants             23,400,000                      
Debt instrument, covenant, compensating cash balance             24,000,000                      
Debt principal that could be redeemed       $ 1,500,000     $ 1,100,000                      
Common stock trading price threshold for debt redemption | $ / shares       $ 8.00                            
Debt principal that could be redeemed based on common stock price       $ 2,200,000                            
Number of elections company can make in 12 month period             3                      
Debt principal that could be redeemed based on company's elections       $ 2,500,000                            
Delivery discount percentage       7.50%     7.50%                      
Number of lowest volume weighted average prices during prior trading days used to compute average | Price       3                            
Number of trading days | Days       20                            
Discount to the prior trading day's volume weighted average price       7.50%     7.50%                      
Duration of average market price used for warrant exercise price             3 days                      
Minimum price condition (per share) | $ / shares             $ 15.00                      
Percentage of VWAPs             92.50%                      
Secured Debt | Amendment Agreement                                    
Debt Instrument [Line Items]                                    
Fixed coupon rate         9.00%                          
Debt instrument, covenant, compensating cash balance         $ 18,500,000                          
Debt principal that could be redeemed         $ 1,500,000                          
Common stock trading price threshold for debt redemption | $ / shares         $ 8.00                          
Debt principal that could be redeemed based on common stock price         $ 2,200,000                          
Debt principal that could be redeemed based on company's elections         $ 2,500,000                          
Price per share that holder can convert outstanding debt balance | $ / shares         $ 12.00                          
Minimum price condition (per share) | $ / shares         $ 4.00                          
Final payment of interest         $ 765,900                          
Maximum prepayment of principle if demanded         $ 18,500,000                          
Premium on outstanding prepayment amount         10.00%                          
Secured Debt | 2017 Amendment Agreement                                    
Debt Instrument [Line Items]                                    
Minimum price condition (per share) | $ / shares   $ 0.35                                
Common stock, shares issued | shares   9,131,868                                
Number of convertible shares | shares   45,000,000                                
Secured Debt | Subsequent Event                                    
Debt Instrument [Line Items]                                    
Redemption limit on any given day, percentage of daily dollar trading volume                             15.00%      
Secured Debt | Subsequent Event | July 2017 Amendment Agreement                                    
Debt Instrument [Line Items]                                    
Delivery discount percentage 20.00%                                  
Percentage of VWAPs 80.00%                                  
Number of days average for exercise price 20 days                                  
Percentage of prior day VMAP 115.00%                                  
Secured Debt | Scenario, Previously Reported [Member] | Securities Purchase Agreement                                    
Debt Instrument [Line Items]                                    
Number of shares availabe from warrants | shares             50,000                      
Secured Debt | Series A Warrant | Common Stock                                    
Debt Instrument [Line Items]                                    
Exercise price | $ / shares                                   $ 8.60
Warrants outstanding, shares | shares                                   50,000
Secured Debt | Series A Warrant | Common Stock | First Waiver                                    
Debt Instrument [Line Items]                                    
Redemption payments       $ 1,500,000                            
Debt instrument, covenant, compensating cash balance       $ 18,500,000 $ 18,500,000                          
Minimum price condition (per share) | $ / shares     $ 0.30 $ 1.00                            
Cash in excess of debenture     $ 10,000,000 $ 10,000,000                            
Daily closing share price appreciation       25.00%                            
Secured Debt | Series A Warrant | Common Stock | Securities Purchase Agreement                                    
Debt Instrument [Line Items]                                    
Warrant term       5 years                            
Exercise price | $ / shares       $ 30.20     $ 30.20                      
Secured Debt | Series A Warrant | Common Stock | Amendment Agreement                                    
Debt Instrument [Line Items]                                    
Exercise price | $ / shares         $ 8.60   $ 8.60                      
Warrants outstanding, shares | shares             50,000