Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts Payable and Accrued Liabilities
Accounts payable	$ 7,184	$ 8,262
Accrued expenses	5,200	3,237
Accrued compensation	5,305	7,631
Accounts Payable and Accrued Expenses	$ 17,689	$ 19,130