Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Liabilities:
Derivative financial instruments—warrants (2)	$ 2,020	$ 4,127
Estimate of Fair Value Measurement | Recurring basis
Assets:
Money market fund	9,209,577	10,131,240
Total Assets	9,209,577	10,131,240
Liabilities:
Derivative financial instruments—warrants (2)	2,020	4,127
Total Liabilities	2,020	4,127
Estimate of Fair Value Measurement | Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Assets:
Money market fund	9,209,577	10,131,240
Total Assets	9,209,577	10,131,240
Liabilities:
Derivative financial instruments—warrants (2)	0	0
Total Liabilities	0	0
Estimate of Fair Value Measurement | Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Money market fund	0	0
Total Assets	0	0
Liabilities:
Derivative financial instruments—warrants (2)	0	0
Total Liabilities	0	0
Estimate of Fair Value Measurement | Recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Money market fund	0	0
Total Assets	0	0
Liabilities:
Derivative financial instruments—warrants (2)	2,020	4,127
Total Liabilities	$ 2,020	$ 4,127