Fair Value Measurements - Fair Value of Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($)	Mar. 31, 2019	Dec. 31, 2017
Fair value of liabilities measured on a recurring basis
Warrant liability	$ 1,275,443	$ 220,376
Total fair value	1,275,443	220,376
Level 3
Fair value of liabilities measured on a recurring basis
Warrant liability	1,275,443	220,376
Total fair value	$ 1,275,443	$ 220,376