Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Servier Loan Agreement - Additional Information (Details)

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Long-Term Debt - Servier Loan Agreement - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Aug. 25, 2017
USD ($)
€ / $
Dec. 31, 2010
EUR (€)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Loss on extinguishment of debt       $ 515
Servier Loan [Member]        
Debt Instrument [Line Items]        
Date of agreement   Dec. 30, 2010    
Maximum borrowing capacity under loan agreement | €   € 15,000,000    
Payment of debt through cash by NIBR $ 14,300      
Euro to US Dollar exchange rates | € / $ 1.1932      
Loss on extinguishment of debt     $ 100