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Organization and Capitalization - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 10, 2020
Mar. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Apr. 28, 2017
Subsidiary, Sale of Stock [Line Items]            
Restructuring and other charges     $ 858 $ 8,800 $ 0  
Inventory write down       7,400    
Severance costs   $ 900   $ 1,400    
Offering price (in dollars per share) $ 0.68         $ 1.00
Warrants, exercise price (in dollars per share) 0.68          
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01 $ 0.01    
Proceeds received in transaction $ 60          
Net proceeds after issuance costs 13,500          
Stock issuance costs incurred $ 1,500          
Common Class A            
Subsidiary, Sale of Stock [Line Items]            
Stocked issued in the period (in shares) 14,121,766          
Offering price (in dollars per share) $ 0.68          
Common Class B            
Subsidiary, Sale of Stock [Line Items]            
Stocked issued in the period (in shares) 7,937,057          
Offering price (in dollars per share) $ 0.68          
Series C Warrants            
Subsidiary, Sale of Stock [Line Items]            
Stocked issued in the period (in shares) 3,308,823          
Series D Warrants            
Subsidiary, Sale of Stock [Line Items]            
Stocked issued in the period (in shares) 3,308,823