Long-term debt	9 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]
Long-term debt	Long-term debt JP Morgan credit facility In October 2015, the Company entered into a credit agreement with J.P. Morgan Chase Bank, N.A. (the “Credit Facility”). The Credit Facility allows the Company to borrow up to $80.0 million, including up to a $10.0 million for the issuance of letters of credit and up to $8.0 million for swing line loans. The Credit Facility matures on October 28, 2020. The Company has the option to repay the borrowings under the Credit Facility without penalty prior to maturity. As of June 30, 2018 and September 30, 2017 the Company was in compliance with all covenants. Obligations under the Credit Facility are collateralized by eligible inventory, accounts receivable and intellectual property of the Company. As of June 30, 2018 and September 30, 2017 the Company did not have any outstanding borrowings under the Credit Facility and had $4.5 million and $4.4 million, respectively, in undrawn letters of credit that reduced the availability under the Credit Facility. The average interest rates were LIBOR +1.25% as of June 30, 2018 and September 30, 2017. Subsequent to the nine months ended June 30, 2018, in July 2018, the Company amended its existing 2015 Credit Facility with J.P. Morgan Chase Bank, N.A. to, among other things, extend its term from October 2020 to October 2021 and provide for a $40.0 million term loan, which increased the Company’s borrowing capacity thereunder from $80.0 million to $120.0 million. In connection with the amendment, the Company borrowed $40.0 million under a term loan (the "New Term Loan”), which the Company used to pay off all outstanding borrowings, accrued interest and fees under its then-outstanding term loan, as described below. The New Term Loan has a maturity date of October 2021 and bears interest at a variable rate equal to an adjusted LIBOR plus 2.25%. The Company will make its first principal payment under the New Term Loan in July 2019 and will make quarterly principal payments thereafter. The Company elected to make interest payments on a semi-annual basis. Term loan In March 2016, the Company entered into a $25.0 million, five-year term loan agreement with Gordon Brothers Finance Company (the “Term Loan”). The Term Loan initially bore interest at a variable rate equal to an adjusted LIBOR plus 10.0%, with a minimum rate of 10.5% per annum. In December 2016, the Company amended the Term Loan (the “Amended Term Loan”) and borrowed an additional $15.0 million net of issuance costs, increasing the aggregate principal amount of the loan to $40.0 million, reducing the interest rate to a variable rate equal to an adjusted LIBOR plus 9.5% and changing prepayment penalty terms. The Amended Term Loan bore interest at a variable rate equal to an adjusted LIBOR plus 9.5%, with a minimum rate of 10.0% per annum. The effective interest rate on the Term Loan was 11.48% and 10.74% as of June 30, 2018 and September 30, 2017, respectively. As of June 30, 2018 and September 30, 2017, the Company was in compliance with all covenants and the carrying value of the Amended Term Loan was $39.7 million and $39.6 million, respectively, net of unamortized debt discount of $0.3 million and $0.4 million, respectively. Obligations under the Amended Term Loan were collateralized by eligible inventory, accounts receivable and intellectual property of the Company. As described above, in July 2018, the Company terminated its $40.0 million Amended Term Loan with Gordon Brothers Finance Company. In connection with the termination and new borrowings under the New Term Loan, the Company paid off all outstanding borrowings, accrued interest, and fees under the Amended Term Loan.

Long-term debt

JP Morgan credit facility

In October 2015, the Company entered into a credit agreement with J.P. Morgan Chase Bank, N.A. (the “Credit Facility”). The Credit Facility allows the Company to borrow up to $80.0 million, including up to a $10.0 million for the issuance of letters of credit and up to $8.0 million for swing line loans. The Credit Facility matures on October 28, 2020. The Company has the option to repay the borrowings under the Credit Facility without penalty prior to maturity. As of June 30, 2018 and September 30, 2017 the Company was in compliance with all covenants. Obligations under the Credit Facility are collateralized by eligible inventory, accounts receivable and intellectual property of the Company. As of June 30, 2018 and September 30, 2017 the Company did not have any outstanding borrowings under the Credit Facility and had $4.5 million and $4.4 million, respectively, in undrawn letters of credit that reduced the availability under the Credit Facility. The average interest rates were LIBOR +1.25% as of June 30, 2018 and September 30, 2017.

Subsequent to the nine months ended June 30, 2018, in July 2018, the Company amended its existing 2015 Credit Facility with J.P. Morgan Chase Bank, N.A. to, among other things, extend its term from October 2020 to October 2021 and provide for a $40.0 million term loan, which increased the Company’s borrowing capacity thereunder from $80.0 million to $120.0 million. In connection with the amendment, the Company borrowed $40.0 million under a term loan (the "New Term Loan”), which the Company used to pay off all outstanding borrowings, accrued interest and fees under its then-outstanding term loan, as described below. The New Term Loan has a maturity date of October 2021 and bears interest at a variable rate equal to an adjusted LIBOR plus 2.25%. The Company will make its first principal payment under the New Term Loan in July 2019 and will make quarterly principal payments thereafter. The Company elected to make interest payments on a semi-annual basis.

Term loan

In March 2016, the Company entered into a $25.0 million, five-year term loan agreement with Gordon Brothers Finance Company (the “Term Loan”). The Term Loan initially bore interest at a variable rate equal to an adjusted LIBOR plus 10.0%, with a minimum rate of 10.5% per annum. In December 2016, the Company amended the Term Loan (the “Amended Term Loan”) and borrowed an additional $15.0 million net of issuance costs, increasing the aggregate principal amount of the loan to $40.0 million, reducing the interest rate to a variable rate equal to an adjusted LIBOR plus 9.5% and changing prepayment penalty terms. The Amended Term Loan bore interest at a variable rate equal to an adjusted LIBOR plus 9.5%, with a minimum rate of 10.0% per annum. The effective interest rate on the Term Loan was 11.48% and 10.74% as of June 30, 2018 and September 30, 2017, respectively. As of June 30, 2018 and September 30, 2017, the Company was in compliance with all covenants and the carrying value of the Amended Term Loan was $39.7 million and $39.6 million, respectively, net of unamortized debt discount of $0.3 million and $0.4 million, respectively. Obligations under the Amended Term Loan were collateralized by eligible inventory, accounts receivable and intellectual property of the Company.

As described above, in July 2018, the Company terminated its $40.0 million Amended Term Loan with Gordon Brothers Finance Company. In connection with the termination and new borrowings under the New Term Loan, the Company paid off all outstanding borrowings, accrued interest, and fees under the Amended Term Loan.