Stock-Based Compensation - Schedule of Share-based Compensation, Restricted Stock Activity (Details) - Restricted Stock and Restricted Stock Units [Member]	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Number of Shares, Unvested at beginning of period | shares	651,110
Number of Shares, Granted | shares	75,000
Number of Shares, Vested | shares	(187,663)	[1]
Number of Shares, Forfeited | shares	(45,000)
Number of Shares, Unvested at end of period | shares	493,447
Weighted-Average Grant-Date Fair Value Unvested at beginning of period | $ / shares	$ 23.65
Weighted-Average Grant-Date Fair Value, Granted | $ / shares	10.97
Weighted-Average Grant-Date Fair Value, Vested | $ / shares	28.83	[1]
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares	22.46
Weighted-Average Grant-Date Fair Value, Unvested at end of period | $ / shares	$ 22.66

[1] The number of vested restricted stock units includes shares that were withheld on behalf of employees to satisfy the minimum statutory tax withholding requirements.