Stock-based Compensation - Schedule of Non-vested Options (Details)	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Share-based Payment Arrangement [Abstract]
Number of Non-vested Options, Beginning Balance | shares	117,464
Number of Non-vested Options, Granted | shares	54,909
Number of Non-vested Options, Forfeited | shares
Number of Non-vested Options, Vested | shares	13,727
Number of Non-vested Options, Ending Balance | shares	158,646
Number of Non-vested Options, Exercisable | shares	739,911
Number of Non-vested Options, Outstanding | shares	898,557
Weighted Average Fair Value at Grant Date, Beginning Balance | $ / shares	$ 14.61
Weighted Average Fair Value at Grant Date, Granted | $ / shares	0.91
Weighted Average Fair Value at Grant Date, Forfeited | $ / shares
Weighted Average Fair Value at Grant Date, Vested | $ / shares	0.91
Weighted Average Fair Value at Grant Date, Ending Balance | $ / shares	12.33
Weighted Average Fair Value at Grant Date, Exercisable | $ / shares	14.08
Weighted Average Fair Value at Grant Date, Outstanding | $ / shares	$ 13.77