Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Information about Company's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

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Fair Value Measurements - Information about Company's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities $ 8,831,981  
Long-term marketable securities 18,686,836  
Warrant liabilities (44,349,846) $ (6,068,978)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 30,108,447 21,433,639
Short-term marketable securities 8,831,981  
Long-term marketable securities 18,686,836  
Total assets (liabilities) 57,627,264 21,433,639
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liabilities 44,349,846 6,068,978
Total assets (liabilities) $ 44,349,846 $ 6,068,978