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At September 30, 2019 and December 31, 2018, accounts payable and accrued expenses consisted of the following (in thousands):
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September 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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352
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$
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83
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Professional fees
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1,531
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2,157
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Selling expenses
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552
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382
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Manufacturing costs
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4,171
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—
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Other vendors
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794
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980
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Total accounts payable
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7,400
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3,602
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Accrued interest payable, related parties
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36
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842
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Accrued interest payable
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824
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2,138
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Accrued expenses:
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Payroll expenses
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819
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713
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Government rebates and other incentives
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1,350
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1,744
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Other accrued expenses
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277
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83
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Total accrued expenses
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2,446
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2,540
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Total accounts payable and accrued expenses
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$
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10,706
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$
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9,122
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