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Selected Balance Sheet Information - Schedule of accrued expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Selected Balance Sheet Information    
Accrued clinical consulting services $ 726 $ 674
Accrued manufacturing costs 670 83
Accrued vendor payments 140 150
Other accrued expenses 8 12
Total $ 1,544 $ 919