Line of Credit	9 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]
Line of Credit	7. Line of Credit The Company maintains a five-year senior secured revolving line of credit (the "line of credit"), with Wells Fargo Bank, N.A. ("Wells Fargo"), that provides for up to $75 million of borrowing capacity, subject to borrowing base availability, as defined in the agreement governing the line of credit. There were no amounts outstanding under the line of credit as of June 30, 2017 and September 30, 2016. During the three and nine months ended June 30, 2017, the Company incurred less than $0.1 million and $0.1 million, respectively, in fees related to the unused portion of the line of credit commitment amount. Such fees were insignificant during the three and nine months ended June 30, 2016. The line of credit contains certain customary representations and warranties, a financial covenant, affirmative and negative covenants, as well as events of default. The Company was in compliance with the line of credit covenants as of June 30, 2017 and September 30, 2016. Please refer to Note 11, "Line of Credit" to the Company’s consolidated financial statements included in the 2016 Annual Report on Form 10‑K for further information on the line of credit arrangement.

Line of Credit

9 Months Ended

Jun. 30, 2017

7. Line of Credit

The Company maintains a five-year senior secured revolving line of credit (the "line of credit"), with Wells Fargo Bank, N.A. ("Wells Fargo"), that provides for up to $75 million of borrowing capacity, subject to borrowing base availability, as defined in the agreement governing the line of credit. There were no amounts outstanding under the line of credit as of June 30, 2017 and September 30, 2016. During the three and nine months ended June 30, 2017, the Company incurred less than $0.1 million and $0.1 million, respectively, in fees related to the unused portion of the line of credit commitment amount. Such fees were insignificant during the three and nine months ended June 30, 2016. The line of credit contains certain customary representations and warranties, a financial covenant, affirmative and negative covenants, as well as events of default. The Company was in compliance with the line of credit covenants as of June 30, 2017 and September 30, 2016. Please refer to Note 11, "Line of Credit" to the Company’s consolidated financial statements included in the 2016 Annual Report on Form 10‑K for further information on the line of credit arrangement.