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Accrued Core Payment (Details) - USD ($)
Mar. 31, 2018
Mar. 31, 2017
Accrued Core Payment [Abstract]    
2019 $ 17,421,000  
2020 7,865,000  
2021 6,651,000  
2022 4,841,000  
Total accrued core payment 36,778,000  
Less amount representing interest (1,769,000)  
Present value of accrued core payment 35,009,000 $ 24,063,000
Less current portion of accrued core payment (16,536,000) (11,714,000)
Long-term portion of accrued core payment $ 18,473,000 $ 12,349,000