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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2015
Jul. 08, 2015
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]                
Net loss $ (2,313) $ (3,526) $ (5,663) $ (7,488) $ (8,937) $ (11,299) $ (16,941) $ (13,151)
Provision for income tax expense $ 0 $ 0     $ 0 $ 0 $ 0 $ 0
Effective tax rate 0.00% 0.00%     0.00% 0.00% 0.00% 0.00%
Unrecognized tax benefits     $ 0       $ 0 $ 0
Federal                
Operating Loss Carryforwards [Line Items]                
Net operating loss carryforward             20,727  
State                
Operating Loss Carryforwards [Line Items]                
Net operating loss carryforward             $ 20,727