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Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Liabilities:    
Derivative financial instruments—warrants $ 42,076 $ 32,315
Estimate of Fair Value Measurement | Recurring basis    
Assets:    
Money market fund 11,258,846 11,392,093
Total Assets 11,258,846 11,392,093
Liabilities:    
Derivative financial instruments—warrants 42,076 32,315
Total Liabilities 42,076 32,315
Estimate of Fair Value Measurement | Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)    
Assets:    
Money market fund 11,258,846 11,392,093
Total Assets 11,258,846 11,392,093
Liabilities:    
Derivative financial instruments—warrants 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 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 42,076 32,315
Total Liabilities $ 42,076 $ 32,315