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Fair Value of Financial Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets:    
Cash equivalents $ 22,299 $ 8,134
Liabilities:    
Derivative liability 18 5,148
Total 18 5,148
Preferred Stock Warrant Liability [Member]    
Liabilities:    
Derivative liability   4,947
Total   4,947
Derivative Liability [Member]    
Liabilities:    
Derivative liability 18 201
Total 18 201
Money Market Funds [Member]    
Assets:    
Cash equivalents 22,299 8,134
Level 2 [Member]    
Assets:    
Cash equivalents 22,299 8,134
Level 2 [Member] | Money Market Funds [Member]    
Assets:    
Cash equivalents 22,299 8,134
Level 3 [Member]    
Liabilities:    
Derivative liability 18 5,148
Total 18 5,148
Level 3 [Member] | Preferred Stock Warrant Liability [Member]    
Liabilities:    
Derivative liability   4,947
Total   4,947
Level 3 [Member] | Derivative Liability [Member]    
Liabilities:    
Derivative liability 18 201
Total $ 18 $ 201