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Fair Value Measurements - Schedule of Financial Assets and Liabilities at Fair value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets:    
Marketable securities $ 42,176  
Estimate of Fair Value Measurement [Member] | Recurring [Member]    
Assets:    
Marketable securities 42,176  
Restricted cash 551 $ 180
Total assets 42,727 4,481
Liabilities:    
Derivative liability 1,235 2,425
Total Liabilities 1,235 2,425
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Money Market Funds [Member]    
Assets:    
Cash equivalents   4,301
Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Recurring [Member]    
Assets:    
Marketable securities 42,176  
Restricted cash 551 180
Total assets 42,727 4,481
Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Recurring [Member] | Money Market Funds [Member]    
Assets:    
Cash equivalents   4,301
Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Recurring [Member]    
Liabilities:    
Derivative liability 1,235 2,425
Total Liabilities $ 1,235 $ 2,425