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Fair Value of Financial Instruments (Schedule of Fair Value of Contingent Consideration Rollforward) (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2018
USD ($)
Fair Value Disclosures [Abstract]  
Beginning balance $ 4,695
Adjustment to estimates (research and development expense) (4,328)
Payout of contingent consideration (392)
Fair value charge recognized in earnings (research and development expense) 25
Ending balance $ 0