Summary of significant accounting policies	9 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]
Summary of significant accounting policies	Summary of significant accounting policies There have been no changes in the Company's significant accounting policies, recently adopted accounting pronouncements, or recent accounting pronouncements pending adoption from those disclosed in the Final Prospectus, except as noted below. Recently adopted accounting pronouncements Revenue from Contracts with Customers In May 2014, the Financial Accounting Standards Board (the "FASB") issued a new standard related to revenue recognition, Accounting Standards Codification (“ASC”) No. 606, Revenue from Contracts with Customers (“ASC 606”). Under ASC 606, revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. In addition, the standard requires disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. ASC 606 is required to be adopted for annual reporting periods beginning after December 15, 2017, including interim periods therein, and may be earlier adopted, though no earlier than for annual reporting periods beginning after December 15, 2016. The Company elected to early adopt ASC 606 effective October 1, 2017, using the full retrospective transition method, which required the Company to adjust each prior reporting period presented. The most significant impact of the adoption of this standard related to the Company’s accounting for arrangements with certain distributors and retail partners with implicit or explicit return rights that were recognized based on a sell-through method under ASC 605, Revenue Recognition. Under ASC 606, revenue with these parties is recognized upon transfer of control to the customer which occurs when the product is either shipped to or delivered to the customer depending on the contractual terms of the arrangement. This change resulted in an acceleration of revenue and related costs of revenue and most significantly, a reduction in deferred costs of revenue and deferred revenue at each balance sheet date. This acceleration of revenue can have a net increase or decrease in the adjusted revenue for the respective fiscal year depending on the year over year impact of the amounts accelerated across reporting periods. The Company has not previously reported its financial statements for fiscal 2017 under ASC 605 and therefore the October 1, 2017 adoption of ASC 606 had no impact on the fiscal 2017 information included in the accompanying condensed consolidated financial statements. Recent accounting pronouncements pending adoption Leases In February 2016, the FASB issued Accounting Standards Update 2016-02, Leases (Topic 842) (“ASU 2016-02”), which amends a number of aspects of lease accounting, including requiring lessees to recognize operating leases with a term greater than one year on their balance sheet as a right-of-use asset and corresponding liability, measured at the present value of the lease payments. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842) Targeted Improvements, which amends ASU 2016-02 to provide an additional transition method option. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those years, with early adoption permitted. The Company is currently evaluating the timing of adoption and the impact of adopting ASU 2016-02 on its consolidated financial statements. Disclosure Update and Simplification In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. This final rule is effective 30 days after publication in the Federal Register. The final rule was not yet published in the Federal Register as of the date this Quarterly Report on Form 10-Q. The Company is evaluating the impact of this guidance on its consolidated financial statements.

Summary of significant accounting policies

There have been no changes in the Company's significant accounting policies, recently adopted accounting pronouncements, or recent accounting pronouncements pending adoption from those disclosed in the Final Prospectus, except as noted below.

Recently adopted accounting pronouncements

Revenue from Contracts with Customers

In May 2014, the Financial Accounting Standards Board (the "FASB") issued a new standard related to revenue recognition, Accounting Standards Codification (“ASC”) No. 606, Revenue from Contracts with Customers (“ASC 606”). Under ASC 606, revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. In addition, the standard requires disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers.

ASC 606 is required to be adopted for annual reporting periods beginning after December 15, 2017, including interim periods therein, and may be earlier adopted, though no earlier than for annual reporting periods beginning after December 15, 2016. The Company elected to early adopt ASC 606 effective October 1, 2017, using the full retrospective transition method, which required the Company to adjust each prior reporting period presented.

The most significant impact of the adoption of this standard related to the Company’s accounting for arrangements with certain distributors and retail partners with implicit or explicit return rights that were recognized based on a sell-through method under ASC 605, Revenue Recognition. Under ASC 606, revenue with these parties is recognized upon transfer of control to the customer which occurs when the product is either shipped to or delivered to the customer depending on the contractual terms of the arrangement. This change resulted in an acceleration of revenue and related costs of revenue and most significantly, a reduction in deferred costs of revenue and deferred revenue at each balance sheet date. This acceleration of revenue can have a net increase or decrease in the adjusted revenue for the respective fiscal year depending on the year over year impact of the amounts accelerated across reporting periods. The Company has not previously reported its financial statements for fiscal 2017 under ASC 605 and therefore the October 1, 2017 adoption of ASC 606 had no impact on the fiscal 2017 information included in the accompanying condensed consolidated financial statements.

Recent accounting pronouncements pending adoption

Leases

In February 2016, the FASB issued Accounting Standards Update 2016-02, Leases (Topic 842) (“ASU 2016-02”), which amends a number of aspects of lease accounting, including requiring lessees to recognize operating leases with a term greater than one year on their balance sheet as a right-of-use asset and corresponding liability, measured at the present value of the lease payments. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842) Targeted Improvements, which amends ASU 2016-02 to provide an additional transition method option. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those years, with early adoption permitted. The Company is currently evaluating the timing of adoption and the impact of adopting ASU 2016-02 on its consolidated financial statements.

Disclosure Update and Simplification

In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. This final rule is effective 30 days after publication in the Federal Register. The final rule was not yet published in the Federal Register as of the date this Quarterly Report on Form 10-Q. The Company is evaluating the impact of this guidance on its consolidated financial statements.