Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Balance of total restricted cash	$ 3,003
Cash and cash equivalents	8,254	$ 10,914	$ 11,664
Restricted cash included in current assets	2,639	2,080	2,768
Restricted cash included in long-term assets	364	507	487
Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows	11,257	$ 13,501	$ 14,919	$ 18,059
Restricted Until Maturity Date
Restricted Cash and Cash Equivalents Items [Line Items]
Balance of total restricted cash	2,639
Restricted Until Expiration of Agreement December 2020
Restricted Cash and Cash Equivalents Items [Line Items]
Balance of total restricted cash	$ 364