Stock-Based Compensation - Schedule of Options to Purchase Shares of Common Stock Outstanding and Exercisable (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Number of Outstanding Options	6,145,044
Weighted Average Remaining Life In Years	7 years 5 months 23 days
Weighted-Average Exercise Price | $ / shares	$ 0.76
Number Exercisable	6,145,044
Exercise Price One [Member]
Exercise Prices | $ / shares	$ 0.22
Number of Outstanding Options	2,524,513
Weighted Average Remaining Life In Years	8 years 8 months 23 days
Weighted-Average Exercise Price | $ / shares	$ 0.22
Number Exercisable	2,524,513
Exercise Price Two [Member]
Exercise Prices | $ / shares	$ 0.38
Number of Outstanding Options	1,162,500
Weighted Average Remaining Life In Years	7 years 3 months 15 days
Weighted-Average Exercise Price | $ / shares	$ 0.375
Number Exercisable	1,162,500
Exercise Price Three [Member]
Exercise Prices | $ / shares	$ 0.51
Number of Outstanding Options	242,966
Weighted Average Remaining Life In Years	7 years 8 months 12 days
Weighted-Average Exercise Price | $ / shares	$ 0.51
Number Exercisable	242,966
Exercise Price Four [Member]
Exercise Prices | $ / shares	$ 0.58
Number of Outstanding Options	271,224
Weighted Average Remaining Life In Years	7 years 29 days
Weighted-Average Exercise Price | $ / shares	$ 0.58
Number Exercisable	271,224
Exercise Price Five [Member]
Exercise Prices | $ / shares	$ 0.73
Number of Outstanding Options	1,025,000
Weighted Average Remaining Life In Years	6 years 5 months 23 days
Weighted-Average Exercise Price | $ / shares	$ 0.73
Number Exercisable	1,025,000
Exercise Price Six [Member]
Exercise Prices | $ / shares	$ 1.37
Number of Outstanding Options	150,000
Weighted Average Remaining Life In Years	5 years 9 months 22 days
Weighted-Average Exercise Price | $ / shares	$ 1.37
Number Exercisable	150,000
Exercise Price Seven [Member]
Exercise Prices | $ / shares	$ 1.43
Number of Outstanding Options	525,000
Weighted Average Remaining Life In Years	5 years 7 months 28 days
Weighted-Average Exercise Price | $ / shares	$ 1.43
Number Exercisable	525,000
Exercise Price Eight [Member]
Exercise Prices | $ / shares	$ 2.60
Number of Outstanding Options	5,280
Weighted Average Remaining Life In Years	4 years 9 months 3 days
Weighted-Average Exercise Price | $ / shares	$ 2.60
Number Exercisable	5,280
Exercise Price Nine [Member]
Exercise Prices | $ / shares	$ 2.79
Number of Outstanding Options	9,760
Weighted Average Remaining Life In Years	4 years 3 months 4 days
Weighted-Average Exercise Price | $ / shares	$ 2.79
Number Exercisable	9,760
Exercise Price Ten [Member]
Exercise Prices | $ / shares	$ 2.95
Number of Outstanding Options	150,000
Weighted Average Remaining Life In Years	4 years 7 months 17 days
Weighted-Average Exercise Price | $ / shares	$ 2.95
Number Exercisable	150,000
Exercise Price Eleven [Member]
Exercise Prices | $ / shares	$ 11.88
Number of Outstanding Options	2,359
Weighted Average Remaining Life In Years	2 years 3 months 4 days
Weighted-Average Exercise Price | $ / shares	$ 11.88
Number Exercisable	2,359
Exercise Price Twelve [Member]
Exercise Prices | $ / shares	$ 15.00
Number of Outstanding Options	75,000
Weighted Average Remaining Life In Years	5 years 7 months 28 days
Weighted-Average Exercise Price | $ / shares	$ 15.00
Number Exercisable	75,000
Exercise Price Thirteen [Member]
Exercise Prices | $ / shares	$ 19.80
Number of Outstanding Options	1,442
Weighted Average Remaining Life In Years	2 years 1 month 2 days
Weighted-Average Exercise Price | $ / shares	$ 19.80
Number Exercisable	1,442