Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.8.0.1
Income Taxes - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Provision for income taxes $ 1,706,000 $ 1,706,000 $ 0