Stockholders' Equity (Details 2)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Risk-free interest rate	1.81%	2.81%	2.20%	2.51%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	52.00%	55.00%	52.00%	57.00%
Expected life	6 years 6 months	6 years 6 months	5 years 3 months 19 days	5 years 2 months 12 days