Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts Payable and Accrued Liabilities
Accounts payable	$ 8,262	$ 4,517
Accrued expenses	3,237	2,004
Accrued compensation	7,631	6,477
Accounts Payable and Accrued Expenses	$ 19,130	$ 12,998