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Stock-based Compensation - 2015 Inducement Plan (Details) - 2015 Inducement Plan [Member] - shares
Jun. 30, 2016
Dec. 31, 2015
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) 165,000 165,000