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Warrants - Additional Information (Detail) - $ / shares
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Warrant or Right [Line Items]      
Weighted average remaining contractual life of warrants 7 years 10 months 24 days    
Warrants Issued in with Two Thousand and Nineteen Credit Agreement [Member] | Redeemable Convertible Series D Preferred Stock [Member]      
Class of Warrant or Right [Line Items]      
Class of warrants number of securities called by the warrants or rights   419,992  
Excercise price of each warrant $ 16.67 $ 16.667  
Warrants Issued in Two Thousand and Eighteen with Convertible Notes [Member] | Common Stock [Member]      
Class of Warrant or Right [Line Items]      
Class of warrants number of securities called by the warrants or rights     501,946
Excercise price of each warrant 0.10   $ 0.10
Term of warrants     10 years
Warrants Issued in Two Thousand and Eighteen Term Loan [Member] | Redeemable Convertible Series D Preferred Stock [Member]      
Class of Warrant or Right [Line Items]      
Class of warrants number of securities called by the warrants or rights     26,998
Excercise price of each warrant $ 16.67   $ 16.667