Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - 2015 Inducement Plan (Details)

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Stock-based Compensation - 2015 Inducement Plan (Details) - 2015 Inducement Plan - shares
Sep. 30, 2018
Mar. 26, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized under the plan (in shares)   450,000
Possible future issuance under equity compensation plan (in shares) 5,000