Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Liabilities [Abstract]
Accrued payroll and employee-related expenses	$ 7,322	$ 6,748
Sales returns and allowances	3,921	3,979
Accrued commissions	3,031	8,734
Accrued bonus	1,728	10,840
Accrued taxes and value-added taxes payable	1,136	1,658
Accrued royalties	495	732
Other accrued liabilities	251	59
Total	$ 17,884	$ 32,750