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Basis of Presentation and Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017
Cash and Cash Equivalents and Restricted Cash | US Treasuries and FDIC Insured
Concentration Risk [Line Items]
Concentration risk, percentage	56.00%
Cash and Cash Equivalents and Restricted Cash | US Treasuries and FDIC Insured
Concentration Risk [Line Items]
Concentration risk, percentage		45.00%
Customer One | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	36.00%	24.00%
Customer Two | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%	11.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Name Accounting Standards Codification
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-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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