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Income Taxes - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]          
Provision or benefit for income taxes $ 0 $ 0 $ 0 $ 0  
Benefit recognized for net operating loss carryforwards 0   0    
Benefit recognized for other deferred tax assets $ 0   $ 0    
Unrecognized tax benefit         $ 600,000
Unrecognized tax benefit that affects effective tax rate         $ 0