Other Accrued Liabilities Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued Expenses [Abstract]
Accrued research and development costs	$ 7,062	$ 2,221
Accrued employee costs	6,818	4,326
Accrued marketing and selling costs	1,973	0
Accrued interest expense	449	274
Accrued other costs	1,817	1,393
Other accrued liabilities	$ 18,119	$ 8,214