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At June 30, 2019 and December 31, 2018, accounts payable and accrued expenses consisted of the following (in thousands):
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June 30, 2019
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December 31, 2018
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Accounts payable:
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Clinical and regulatory expenses
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$
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252
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$
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83
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Professional fee
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807
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2,157
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Selling expenses
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1,568
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382
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Manufacturing costs
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2,198
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—
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Other vendors
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487
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980
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Total accounts payable
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5,312
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3,602
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Accrued interest payable, related parties
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1,553
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842
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Accrued interest payable
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2,270
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2,138
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Accrued expenses:
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Payroll expenses
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803
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713
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Accrued rebates
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1,400
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1,744
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Other accrued expenses
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117
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83
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Total accrued expenses
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2,320
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2,540
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Total accounts payable and accrued expenses
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$
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11,455
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$
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9,122
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