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Summary of Significant Accounting Policies - EPS and SBC (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 26, 2016
shares
Nov. 11, 2014
shares
Nov. 12, 2013
Sep. 30, 2016
USD ($)
$ / shares
shares
Aug. 31, 2016
USD ($)
item
$ / shares
shares
Nov. 30, 2015
shares
Nov. 30, 2014
shares
Sep. 30, 2016
USD ($)
item
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
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Jun. 30, 2016
$ / shares
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Computation of Net Loss per Common Share                    
Options outstanding to purchase common stock and unvested restricted stock               14,929,000 11,494,000  
Common stock equivalents under treasury stock method for options (in shares)               3,000 1,296,000  
Shares issuable upon conversion of convertible notes (in shares) | item               23,878    
Common stock equivalents under if-converted method for convertible notes (in shares)               23,878,000    
Additional disclosure for options                    
Cash received for exercise of stock options | $                 $ 4,462,000  
Restricted stock                    
Stock-Based Compensation                    
Exercise period         5 years          
Number of equal installments restrictions lapse | item         3          
Weighted-average assumptions used to estimate the fair value of each stock option                    
Weighted-average grant date fair values of options granted (in dollars per share) | $ / shares         $ 3.15          
Number of Restricted Stock                    
Awarded (in shares)         117,800          
Additional disclosure for options                    
Stock compensation expense (reduction) | $         $ 0          
2006 Plan                    
Stock-Based Compensation                    
Number of employee share-based compensation plans | item               1    
Additional number of shares authorized for issuance   5,500,000                
Common stock authorized for issuance (in shares)   17,500,000                
Number of Stock Options                    
Granted (in shares)               1,676,599    
Additional disclosure for options                    
Stock compensation expense (reduction) | $               $ 4,400,000 $ 5,700,000  
Estimated fair value of unvested employee awards, net of estimated forfeitures | $       $ 24,300,000       $ 24,300,000    
Weighted average vesting period of unvested employee awards               2 years    
2006 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    
Dividend (as a percent)               0.00% 0.00%  
Volatility (as a percent)               65.65% 67.07% 67.07%
Risk-free interest rate (as a percent)               1.26% 1.89% 1.89%
Expected life               6 years 3 months 18 days 6 years 3 months 18 days  
Weighted-average grant date fair values of options granted (in dollars per share) | $ / shares               $ 1.79 $ 10.31  
Number of Stock Options                    
Outstanding at the beginning of the period (in shares)               11,813,000    
Granted (in shares)               3,341,000    
Forfeited/Canceled (in shares)               (436,000)    
Outstanding at the end of the period (in shares)       14,718,000       14,718,000   11,813,000
Weighted-Average Exercise Price                    
Outstanding at the beginning of the period (in dollars per share) | $ / shares               $ 13.03    
Granted (in dollars per share) | $ / shares               2.95    
Exercised (in dollars per share) | $ / shares               0.00    
Forfeited/Canceled (in dollars per share) | $ / shares               10.41    
Outstanding at the end of the period (in dollars per share) | $ / shares       $ 10.82       $ 10.82   $ 13.03
2006 Plan | Stock options | Maximum                    
Stock-Based Compensation                    
Vesting period               4 years    
Additional disclosure for options                    
Share Based Compensation Arrangements by Share Based Payment Award, Options Expiration Term               10 years    
Compensation Policy for Non-Employee Directors | Stock options                    
Stock-Based Compensation                    
Vesting period     1 year              
Number of Stock Options                    
Granted (in shares)           80,000 80,000      
Compensation Policy for Non-Employee Directors | Deferred share units                    
Stock-Based Compensation                    
Vesting period     1 year              
Additional disclosure for options                    
Stock compensation expense (reduction) | $               $ 108,000 $ 82,000  
Workforce reduction                    
Stock-Based Compensation                    
Vesting period       3 years            
Number of Stock Options                    
Granted (in shares)       847,000            
Additional disclosure for options                    
Stock compensation expense (reduction) | $               $ (837,000)    
Workforce reduction | Stock options                    
Number of Stock Options                    
Forfeited/Canceled (in shares) (762,000)             (762,000)    
Additional disclosure for options                    
Stock compensation expense (reduction) | $               $ (837,000)