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Fair Value Measurements - Schedule of Financial Assets and Liabilities at Fair value on a Recurring Basis (Detail) - Estimate of Fair Value Measurement [Member] - Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Assets:    
Marketable securities $ 9,247  
Restricted cash 160 $ 180
Total assets 12,657 4,481
Liabilities:    
Derivative liability 2,391 2,425
Total Liabilities 2,391 2,425
Cash Equivalents [Member]    
Assets:    
Cash equivalents 3,250  
Money Market Funds [Member]    
Assets:    
Cash equivalents   4,301
Level 1 [Member]    
Assets:    
Marketable securities 9,247  
Restricted cash 160 180
Total assets 12,657 4,481
Level 1 [Member] | Cash Equivalents [Member]    
Assets:    
Cash equivalents 3,250  
Level 1 [Member] | Money Market Funds [Member]    
Assets:    
Cash equivalents   4,301
Level 3 [Member]    
Liabilities:    
Derivative liability 2,391 2,425
Total Liabilities $ 2,391 $ 2,425