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Summary of Significant Accounting Policies - EPS and SBC (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 13, 2017
shares
Dec. 09, 2016
shares
Jun. 30, 2017
item
$ / shares
shares
Feb. 28, 2017
item
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Sep. 30, 2016
shares
Aug. 31, 2016
item
$ / shares
shares
Nov. 30, 2015
shares
Sep. 30, 2017
USD ($)
item
$ / shares
shares
Sep. 30, 2016
USD ($)
item
$ / shares
shares
Sep. 30, 2017
USD ($)
employee
item
$ / shares
shares
Sep. 30, 2016
USD ($)
item
$ / shares
shares
Computation of Net Loss per Common Share                        
Options outstanding to purchase common stock and unvested restricted stock                 15,360,000 14,929,000 15,360,000 14,929,000
Common stock equivalents under treasury stock method for options and unvested restricted stock (in shares)                 2,570,000 3,000 1,210,000 306,000
Shares issuable upon conversion of convertible notes (in shares) | item                 740 23,878 740 23,878
Common stock equivalents under if-converted method for convertible notes (in shares)                 18,685,000 23,878,000 22,128,000 8,976,000
Additional disclosure for options                        
Cash received for exercise of stock options | $                     $ 363,000 $ 370,000
Stock compensation expense (reduction) | $                 $ 2,600,000 $ 4,400,000 8,300,000 16,000,000
Estimated fair value of unvested employee awards, net of estimated forfeitures | $                 $ 15,500,000   $ 15,500,000  
Weighted average vesting period of unvested employee awards                     2 years  
Chief Executive Officer                        
Additional disclosure for options                        
Stock compensation cost due to modification | $                       $ 3,200,000
Minimum                        
Weighted-Average Exercise Price                        
Exercised (in dollars per share) | $ / shares                     $ 3.05  
Maximum                        
Weighted-Average Exercise Price                        
Exercised (in dollars per share) | $ / shares                     $ 4.50  
Stock options                        
Weighted-average assumptions used to estimate the fair value of each stock option                        
Dividend (as a percent)                 0.00% 0.00% 0.00% 0.00%
Volatility (as a percent)                 69.31% 65.65% 67.26% 65.40%
Risk-free interest rate (as a percent)                 1.93% 1.26% 2.00% 1.29%
Expected life                 6 years 6 years 3 months 18 days 6 years 6 years 3 months 18 days
Weighted-average grant date fair value (in dollars per share) | $ / shares                 $ 4.13 $ 1.79 $ 1.91 $ 2.15
Number of Stock Options                        
Outstanding at the beginning of the period (in shares)                     13,679  
Granted (in shares)                     1,533  
Exercised (in shares)                     (94)  
Forfeited/Canceled (in shares)                     (2,165)  
Outstanding at the end of the period (in shares)         13,679       12,953   12,953  
Weighted-Average Exercise Price                        
Outstanding at the beginning of the period (in dollars per share) | $ / shares                     $ 10.70  
Granted (in dollars per share) | $ / shares                     3.10  
Exercised (in dollars per share) | $ / shares                     3.88  
Forfeited/Canceled (in dollars per share) | $ / shares                     10.28  
Outstanding at the end of the period (in dollars per share) | $ / shares         $ 10.70       $ 9.92   $ 9.92  
Additional disclosure for options                        
Cash received for exercise of stock options | $                       $ 363,000
Restricted stock                        
Stock-Based Compensation                        
Exercise period     5 years 5 years     5 years          
Number of equal installments restrictions lapse | item     3 3     3          
Number of Restricted Stock                        
Unvested at the beginning of the period (in shares)                     199,000  
Awarded (in shares)                     2,253,000  
Vested (in shares)                     (25,000)  
Forfeited (in shares)                     (20,000)  
Unvested at the end of the period (in shares)         199,000       2,407,000   2,407,000  
Weighted-Average Exercise Price                        
Awarded (in dollars per share) | $ / shares             $ 3.15          
Additional disclosure for options                        
Stock compensation expense (reduction) | $                     $ 0  
Restricted stock | Officers                        
Number of Restricted Stock                        
Awarded (in shares)     239,000 529,830     117,800          
Weighted-Average Exercise Price                        
Awarded (in dollars per share) | $ / shares     $ 4.71 $ 2.47     $ 3.15          
Compensation Policy for Non-Employee Directors                        
Number of Stock Options                        
Granted (in shares)     80,000                  
Additional disclosure for options                        
Stock compensation expense (reduction) | $                 $ 61,000 $ 10,800 $ 146,000 $ 323,000
Compensation Policy for Non-Employee Directors | Stock options                        
Stock-Based Compensation                        
Vesting period                     1 year  
Number of Stock Options                        
Granted (in shares)         40,000     80,000        
Compensation Policy for Non-Employee Directors | Deferred share units                        
Stock-Based Compensation                        
Vesting period   1 year                    
2016 Plan                        
Computation of Net Loss per Common Share                        
Common stock equivalents under treasury stock method for options and unvested restricted stock (in shares)   14,250,000                    
Stock-Based Compensation                        
Number of employee share-based compensation plans | employee                     1  
Additional shares authorized for issuance (in shares) 1,000,000                      
Common stock authorized for issuance (in shares)   5,500,000                    
2016 Plan | Stock options                        
Weighted-average assumptions used to estimate the fair value of each stock option                        
Number of group of awards for which expected term is calculated for and applied | item                     1  
2016 Plan | Stock options | Maximum                        
Stock-Based Compensation                        
Vesting period                     4 years  
Exercise period                     10 years  
Workforce reduction                        
Stock-Based Compensation                        
Vesting period           3 years            
Number of Stock Options                        
Granted (in shares)           731,000            
Workforce reduction | Stock options                        
Number of Stock Options                        
Forfeited/Canceled (in shares)                   (762,000)    
Additional disclosure for options                        
Stock compensation expense (reduction) | $                   $ (837,000)