Accrued Expenses and Other Current Liabilities - Tabular Disclosure (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Expenses
Accrued incentive compensation	$ 5,522	$ 11,760
Accrued vacation	3,484	2,540
Salaries	2,662	2,973
Professional fees	2,313	1,421
Other employee benefits	1,072	1,260
Accrued interest	301	301
Other	2,601	10,210
Total accrued expenses and other current liabilities	$ 17,955	$ 30,465