Stock Based Compensation - Summary of Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Number of Shares
Number of shares, beginning balance	45,405
Number of shares, forfeitures or expirations	45,405
Number of shares, ending balance	0	45,405
Weighted Average Exercise Price
Weighted average exercise price, beginning balance (in dollars per share)	$ 54.05
Weighted average exercise price, forfeitures or expirations (in dollars per share)	54.05
Weighted average exercise price, ending balance (in dollars per share)	$ 0.00	$ 54.05
Additional Disclosures
Number of shares, vested or expected to vest	0
Number of shares, exercisable	0
Weighted average exercise price, vested or expected to vest (in dollars per share)	$ 0.00
Weighted average exercise price, exercisable (in dollars per share)	$ 0.00
Weighted average remaining contractual life (years)	0 years	1 month 18 days
Weighted average remaining contractual life (years), vested or expected to vest	0 years
Weighted average remaining contractual life (years), exercisable	0 years
Options, outstanding, intrinsic value	$ 0	$ 0
Options vested or expected to vest, intrinsic value	0
Options exercisable, intrinsic value	$ 0