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Stock-based Compensation - 2015 Inducement Plan (Details) - shares
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 26, 2015
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Annual vesting percentage 25.00%    
Vesting period 4 years    
2015 Inducement Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized under the plan     450,000
Possible future issuance under equity compensation plan (shares) 165,000 165,000