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Fair Value Measurements - Convertible Debt Securities (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Nov. 28, 2016
Jun. 30, 2017
Sep. 30, 2016
Convertible Debt Securities      
Assets:      
Discount rate (as a percent)   23.00%  
Risk-adjusted discount rate (as a percent)   23.00%  
Share price (in dollars per share)   $ 1.76  
Expected volatility rate (as a percent)   55.00%  
Convertible debt securities, carrying value $ 5,800    
Convertible Debt Securities | Fair Value, Measurements, Recurring      
Assets:      
Convertible debt securities     $ 5,774
Convertible Debt Securities | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring      
Assets:      
Convertible debt securities 5,600   $ 5,774
Minimum | Convertible Debt Securities      
Assets:      
Payout period (in years)   1 year 6 months  
Risk free interest rate (as a percent)   0.96%  
Expected payoff period (in years)   1 year 6 months  
Maximum | Convertible Debt Securities      
Assets:      
Payout period (in years)   3 years 2 months 12 days  
Risk free interest rate (as a percent)   1.39%  
Expected payoff period (in years)   3 years 22 days  
Other Nonoperating Income (Expense)      
Assets:      
Loss on settlement of financial instruments   $ 200  
Other Nonoperating Income (Expense) | Convertible Debt Securities      
Assets:      
Loss on settlement of financial instruments $ 200