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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

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