Subsequent Events - Additional Information (Details) - $ / shares	Oct. 20, 2017	Oct. 16, 2017	Jan. 29, 2016	Sep. 30, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Common stock, shares authorized				19,900,000	19,900,000
Common stock, par value			$ 0.01	$ 0.01	$ 0.01
Preferred stock, par value			$ 0.01
Rights expiration date			Jan. 29, 2026
Subsequent Event
Subsequent Event [Line Items]
Number of shares authorized to issue		500,000,000
Common stock, shares authorized		450,000,000
Common stock, par value		$ 0.01
Preferred stock, shares authorized		50,000,000
Preferred stock, par value		$ 0.01
Subsequent Event | American Stock Transfer & Trust Company LLC
Subsequent Event [Line Items]
Amended date	Jan. 29, 2016
Rights accelerated expiration date	Oct. 20, 2017