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Commitments and Contingencies - Additional Information (Detail)
$ / shares in Units, € in Millions
 3 Months Ended 9 Months Ended
Dec. 15, 2019
USD ($)
Sep. 15, 2019
USD ($)
Aug. 02, 2019
USD ($)
Jul. 18, 2019
USD ($)
shares
Jul. 01, 2019
Dec. 19, 2018
USD ($)
shares
Nov. 29, 2017
USD ($)
May 05, 2017
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Vehicle
Sep. 30, 2019
USD ($)
Vehicle
Sep. 30, 2019
EUR (€)
Aug. 06, 2019
$ / shares
shares
Jun. 30, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 26, 2018
$ / shares
shares
Jul. 01, 2013
USD ($)
Commitments And Contingencies [Line Items]                                  
Purchase obligation extended term     2 years                            
Payment of long term purchase commitment, amendment fees   $ 1,500,000                              
Supply Agreement expiration period                     Dec. 31, 2026            
Supply Agreement renewal period                     2 years            
Foreign currency hedging transaction period         90 days                        
Purchase requirement amount for remaining current year | €                       € 1.9          
Warrants to purchase of common stock | shares                         1,171,614        
Exercise price of warrants | $ / shares                         $ 1.11        
Exercise price of warrants | $ / shares                         $ 1.11        
Operating lease, non-current liabilities                 $ 2,746,000   $ 2,746,000            
Operating lease costs                 400,000   1,100,000            
Operating lease, cash paid                 500,000   1,300,000            
Variable lease costs                 $ 100,000   $ 300,000            
Operating lease, weighted average discount rate                 7.50%   7.50% 7.50%          
Operating lease, weighted-average remaining lease term                 3 years 3 months 18 days   3 years 3 months 18 days 3 years 3 months 18 days          
Vehicle Leases | Lease Agreement with Enterprise                                  
Commitments And Contingencies [Line Items]                                  
Number of vehicle leases | Vehicle                   119 90            
Operating lease rent expenses                   $ 83,000 $ 72,000            
Number of vehicle leases removed | Vehicle                     29            
Gain or loss recorded for leases removed                     $ 0            
Lease expiration date                   48 months              
Reduction in operating lease right-of-use assets                           $ 600,000      
Reduction in operating lease liabilities                           600,000      
Operating lease right-of-use assets                             $ 1,600,000    
Operating lease liabilities                 $ 1,300,000   1,300,000       1,600,000    
Operating lease, current assets                 1,600,000   1,600,000            
Operating lease, other current liabilities                 600,000   600,000            
Underwriting Agreement                                  
Commitments And Contingencies [Line Items]                                  
Stock purchase agreements date           Dec. 26, 2018                      
Warrant expiration date           Dec. 26, 2019                      
Underwriting Agreement | Common Stock                                  
Commitments And Contingencies [Line Items]                                  
Number of shares sold in underwritten public offering | shares           26,666,667                      
Amount of net proceeds from issuance of securities           $ 37,300,000                      
Exchange price per share | $ / shares                               $ 1.50  
Underwriting Agreement | Warrants                                  
Commitments And Contingencies [Line Items]                                  
Warrants to purchase of common stock | shares                               26,666,667  
Exercise price of warrants | $ / shares                               $ 1.60  
Repurchase of common stock , shares | shares       3,333,334                          
Repurchase of common stock , value       $ 400,000                          
Shares reserved for future issuance | shares       23,333,333                          
Exercise price of warrants | $ / shares                               $ 1.60  
Cost of Goods Sold                                  
Commitments And Contingencies [Line Items]                                  
Purchase commitments, amendment fees     $ 2,750,000                            
Scenario Forecast                                  
Commitments And Contingencies [Line Items]                                  
Purchase commitments, amendment fees $ 1,250,000                                
Deerfield | Milestone Rights Liability                                  
Commitments And Contingencies [Line Items]                                  
Contingent liability for milestone payments                           75,000,000      
Deerfield | Milestone Rights Liability | Maximum                                  
Commitments And Contingencies [Line Items]                                  
Contingent liability for milestone payments                           $ 90,000,000     $ 90,000,000
Russell Ranch Road II LLC | Office Lease                                  
Commitments And Contingencies [Line Items]                                  
Operating lease rent expenses             $ 35,969                    
Operating lease right-of-use assets                             3,200,000    
Operating lease liabilities                             3,500,000    
Operating lease rent expenses               $ 40,951 $ 100,000   $ 400,000            
Percentage of annual increase in lease payment             3.00% 3.00%                  
Lease expiration date             Jan. 31, 2023 Jan. 31, 2023                  
Lease renewal option             5 years 5 years                  
Reimbursement amount received for tenant improvements             $ 56,325                    
Operating lease, current liabilities                             900,000    
Operating lease, non-current liabilities                             $ 2,600,000