Commitments and Contingencies	3 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letters of Credit At December 31, 2016 and September 30, 2016, the Company had approximately $4.6 million and $2.0 million of letters of credit outstanding related primarily to customer advances and other performance obligations. These arrangements guarantee the refund of advance payments received from our customers in the event that the product is not delivered or warranty obligations are not fulfilled in accordance with the contract terms. These obligations could be called by the beneficiaries at any time before the expiration date of the particular letter of credit if the Company fails to meet certain contractual requirements. None of these obligations were called during the three months ended December 31, 2016 and the fiscal year ended September 30, 2016, and the Company currently does not anticipate any of these obligations to be called in the near future. Contingencies During fiscal year 2016, the Company discovered that it inadvertently failed to register on Form S-8 with the Securities and Exchange Commission certain shares of common stock previously authorized for issuance by the Company’s Board of Directors and stockholders under the Company’s 1995 Employee Stock Purchase Plan, as amended (the “ESPP”). As a result, certain purchasers of common stock under the ESPP may have the right to rescind their purchases for an amount equal to the purchase price paid for the shares, plus interest from the date of purchase, limited to the shares purchased in the last twelve months, which is the applicable federal statute of limitations, and still held by the original purchasers. These shares have been treated as issued and outstanding for financial reporting purposes. As of December 31, 2016, there were approximately 90,358 shares of common stock issued under the ESPP and held by the original purchasers of such shares which may be subject to these rescission rights. Of these, 43,968 shares were originally purchased for $8.00 per share and 46,390 shares were originally purchased for $8.02 per share. If holders of all of these shares seek to rescind their purchases, the Company could be required to make aggregate payments of up to approximately $0.8 million, which includes estimated statutory interest. The Company may also be subject to civil and other penalties by regulatory authorities as a result of the potential failure to register these shares. The Company does not believe that the failure to register the shares on a Form S-8 or a potential rescission offer, if any, will have a material impact on its consolidated financial statements. The Company is subject to various legal proceedings, both asserted and unasserted, that arise in the ordinary course of business. The Company cannot predict the ultimate outcome of such legal proceedings or in certain instances provide reasonable ranges of potential losses. However, as of the date of this report, the Company believes that none of these claims will have a material adverse effect on its consolidated financial position or results of operations. In the event of unexpected subsequent developments and given the inherent unpredictability of these legal proceedings, there can be no assurance that the Company's assessment of any claim will reflect the ultimate outcome, and an adverse outcome in certain matters could, from time to time, have a material adverse effect on the Company's consolidated financial position or results of operations in particular quarterly or annual periods.

Commitments and Contingencies

Letters of Credit

At December 31, 2016 and September 30, 2016, the Company had approximately $4.6 million and $2.0 million of letters of credit outstanding related primarily to customer advances and other performance obligations. These arrangements guarantee the refund of advance payments received from our customers in the event that the product is not delivered or warranty obligations are not fulfilled in accordance with the contract terms. These obligations could be called by the beneficiaries at any time before the expiration date of the particular letter of credit if the Company fails to meet certain contractual requirements. None of these obligations were called during the three months ended December 31, 2016 and the fiscal year ended September 30, 2016, and the Company currently does not anticipate any of these obligations to be called in the near future.

Contingencies

During fiscal year 2016, the Company discovered that it inadvertently failed to register on Form S-8 with the Securities and Exchange Commission certain shares of common stock previously authorized for issuance by the Company’s Board of Directors and stockholders under the Company’s 1995 Employee Stock Purchase Plan, as amended (the “ESPP”). As a result, certain purchasers of common stock under the ESPP may have the right to rescind their purchases for an amount equal to the purchase price paid for the shares, plus interest from the date of purchase, limited to the shares purchased in the last twelve months, which is the applicable federal statute of limitations, and still held by the original purchasers. These shares have been treated as issued and outstanding for financial reporting purposes.

As of December 31, 2016, there were approximately 90,358 shares of common stock issued under the ESPP and held by the original purchasers of such shares which may be subject to these rescission rights. Of these, 43,968 shares were originally purchased for $8.00 per share and 46,390 shares were originally purchased for $8.02 per share. If holders of all of these shares seek to rescind their purchases, the Company could be required to make aggregate payments of up to approximately $0.8 million, which includes estimated statutory interest. The Company may also be subject to civil and other penalties by regulatory authorities as a result of the potential failure to register these shares. The Company does not believe that the failure to register the shares on a Form S-8 or a potential rescission offer, if any, will have a material impact on its consolidated financial statements.

The Company is subject to various legal proceedings, both asserted and unasserted, that arise in the ordinary course of business. The Company cannot predict the ultimate outcome of such legal proceedings or in certain instances provide reasonable ranges of potential losses. However, as of the date of this report, the Company believes that none of these claims will have a material adverse effect on its consolidated financial position or results of operations. In the event of unexpected subsequent developments and given the inherent unpredictability of these legal proceedings, there can be no assurance that the Company's assessment of any claim will reflect the ultimate outcome, and an adverse outcome in certain matters could, from time to time, have a material adverse effect on the Company's consolidated financial position or results of operations in particular quarterly or annual periods.