Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accrued Liabilities
Employee bonuses	$ 325	$ 1,437
Accrued professional fees and other	324	367
Total accrued liabilities	$ 649	$ 1,804

Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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