Stock-Based Compensation - Schedule of Outstanding Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) - $ / shares	1 Months Ended		6 Months Ended	12 Months Ended
	Apr. 30, 2018	Feb. 28, 2017	Jun. 30, 2018	Dec. 31, 2017
Outstanding Shares [Roll Forward]
Outstanding at beginning of period (in shares)			690,000
Granted (in shares)	335,000	700,000	335,000
Exercised (in shares)			0
Expired/forfeited (in shares)			(7,500)
Outstanding at end of period (in shares)			1,017,500	690,000
Options vested and exercisable (in shares)			280,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Outstanding at beginning of period, Weighted Average Exercise Price Per Share (in dollars per share)			$ 7.20
Granted, Weighted Average Exercise Price Per Share (in dollars per share)			4.46
Exercised, Weighted Average Exercise Price Per Share (in dollars per share)			0.00
Expired/forfeited , Weighted Average Exercise Price Per Share (in dollars per share)			0.00
Outstanding at end of period, Weighted Average Exercise Price Per Share (in dollars per share)			6.30	$ 7.20
Options vested and exercisable, Weighted Average Exercise Price Per Share (in dollars per share)			$ 7.20
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Non-vested RSUs, Weighted Average Remaining Contractual Term (in years)			4 years	4 years 3 months 18 days
Granted non-vested options, Weighted Average Remaining Contractual Term (in years)			4 years 9 months 18 days
Options vested and exercisable, Weighted Average Remaining Contractual Term (in years)			3 years 7 months 6 days