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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Restricted Cash        
Cash and cash equivalents $ 69,511 $ 49,207    
Total cash, cash equivalents and current portion of restricted cash 69,526 49,222    
Long-term portion of restricted cash 4,000 4,000    
Total cash, cash equivalents and restricted cash 73,526 53,222 $ 33,611 $ 34,624
Amount in excess of FDIC and CDIC limits 68,200 47,900    
Standby letters of credit        
Restricted Cash        
Restricted cash 15 15    
Long-term portion of restricted cash $ 4,000 $ 4,000