Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Balance of total restricted cash	$ 3,133
Cash and cash equivalents	8,003	$ 10,914	$ 7,135
Restricted cash included in current assets	2,771	2,080	6,020
Restricted cash included in long-term assets	362	507	0
Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows	11,136	$ 13,501	$ 13,155	$ 18,059
Restricted Until Maturity Date
Restricted Cash and Cash Equivalents Items [Line Items]
Balance of total restricted cash	2,771
Restricted Until Expiration of Agreement December 2020
Restricted Cash and Cash Equivalents Items [Line Items]
Balance of total restricted cash	$ 362