Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 45,430	$ 43,531	$ 95,644	$ 95,615
Restricted Cash and Cash Equivalents, Current	$ 611
Restricted Cash and Cash Equivalents, Asset, Statement of Financial Position [Extensible List]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Restricted Cash and Cash Equivalents, Noncurrent	$ 1,110	$ 2,912	$ 1,130	$ 1,692
Restricted Cash and Cash Equivalents, Noncurrent, Asset, Statement of Financial Position [Extensible List]	Other Assets, Noncurrent	Other Assets, Noncurrent	Other Assets, Noncurrent	Other Assets, Noncurrent
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total	$ 47,151	$ 46,443	$ 96,774	$ 97,307