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Other Financial Information - Accrued liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Financial Information [Abstract]    
Accrued payroll and related expenses $ 2,850 $ 2,111
Accrued deferred offering costs 1,598 355
Accrued interest 182 178
Accrued purchases of goods and services 292 243
Accrued royalties 708 602
Accrued clinical study activity 43 146
Capital lease obligations, current portion 179 81
Other accrued liabilities 597 207
Accrued liabilities $ 6,449 $ 3,923