Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 58,824	$ 86,907
Restricted cash - current	6,716	9,127
Restricted cash - long-term	406	7,176
Cash, cash equivalents and restricted cash	65,946	103,210	$ 14,018
Dividend payments on preferred stock
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - current	6,716	8,954
Restricted cash - long-term	0	6,716
Cash held in escrow account
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - current	0	173
Letter of credit
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - long-term	306	410
Cash required per note agreement
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - long-term	$ 100	$ 50