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Notes Payable - Term Loan Agreement - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended 9 Months Ended 24 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2016
Aug. 31, 2019
Dec. 31, 2022
Sep. 30, 2019
Jan. 01, 2022
Jan. 01, 2021
Common Stock [Member]                    
Debt Instrument                    
Number of shares issuable for warrants outstanding (in shares)     568,291   528,958     568,291    
Exercise price of warrants     $ 1.55 $ 4.35 $ 8.06     $ 1.55    
CRG [Member] | Term Loan Agreement [Member]                    
Debt Instrument                    
Proceeds from issuance of long-term debt         $ 40,000,000          
Debt term (in years)         6 years          
Debt instrument, term of interest-only payments (in years)         4 years          
Final fee as a percentage of the principal outstanding (as a percent)     10.00%   8.00% 8.00%   10.00%    
Annual fixed rate (as a percent)         11.50%          
Deferred interest rate (as a percent)         3.50%          
Debt instrument, prepayment fee term (in years)         5 years          
Debt instrument covenant compliance revenue targeted for fiscal year   $ 95,000,000 $ 4,000,000 $ 9,000,000   $ 9,000,000        
Additional interest rate, event of default (as a percent)               4.00%    
Derivative liability   $ 2,100,000 $ 2,600,000         $ 2,600,000    
CRG [Member] | Term Loan Agreement [Member] | Scenario Forecast [Member]                    
Debt Instrument                    
Debt instrument, quarterly principal payment             $ 12,000,000      
Debt instrument covenant compliance revenue targeted for fiscal year $ 140,000,000               $ 43,000,000 $ 15,000,000