Notes payable consists of the following (in thousands): | | | December 31, | | September 30, | | | | | 2015 | | 2016 | | | Note payable, convertible debt | | $ | 38 | | $ | 38 | | | Due to Monster, Inc. | | | 450 | | | — | | | Interest and loan origination fee accrued related to promissory notes payable and accrued at issuance | | | 1,108 | | | — | | | Promissory notes payable, 2015 bridge loans, net of debt discount of $563 and $0, respectively, and net of debt issuance cost of $483 and $0, respectively | | | 1,909 | | | — | | | Total | | $ | 3,505 | | $ | 38 | |
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