Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 5,704 $ 10,865 $ 13,983  
Restricted cash, current 6,124 1,342 3,063  
Restricted cash, long-term   5,000 20,000  
Total cash, cash equivalents and restricted cash at the end of period $ 11,828 $ 17,207 $ 37,046 $ 35,912