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Significant Accounting Policies - Schedule of Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Cash and cash equivalents $ 1,620 $ 1,441 $ 545
Restricted cash, current portion 535 255
Restricted cash, net of current portion 2,417 3,200 3,404
Total cash and cash equivalents and restricted cash $ 4,037 $ 5,176 $ 4,204