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Notes Payable - Components of Notes Payable and Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Components of notes payable    
Short-term note payable $ 202 $ 203
Current portion of long-term note payable   270
Long-term notes payable   6,230
Principal balance of notes payable 202 6,703
Warrants issued as part of debt refinancing   (365)
Loan cost capitalization   (341)
Total notes payable, net $ 202 $ 5,997