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Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
May 31, 2016
Apr. 30, 2016
Mar. 31, 2016
Aug. 31, 2012
Summarized information about the term loan [Abstract]                
Less current portion of term loan $ (3,064,000)   $ (3,064,000)       $ (3,067,000)  
Long-term portion of term loan 17,691,000   17,691,000       $ 19,980,000  
Credit Facility [Member]                
Credit Facility [Abstract]                
Maximum borrowing capacity 125,000,000   $ 125,000,000          
Debt instrument, maturity date     Jun. 03, 2020          
Credit Facility [Member] | Minimum [Member]                
Credit Facility [Abstract]                
Facility fee on total leverage ratio     0.25%          
Credit Facility [Member] | Maximum [Member]                
Credit Facility [Abstract]                
Dividend payments, annual maximum amount permitted     $ 10,000,000          
Facility fee on total leverage ratio     0.375%          
Credit Facility [Member] | LIBOR [Member]                
Credit Facility [Abstract]                
Reference interest rate under option 1, floor     2.50%          
Interest rate over LIBOR rate under option 1     2.75%          
Interest rate above base rate under option 2     3.00%          
Credit Facility [Member] | Reference Rate [Member]                
Credit Facility [Abstract]                
Reference interest rate under option 1, floor     1.50%          
Interest rate over LIBOR rate under option 1     1.75%          
Interest rate above base rate under option 2     2.00%          
Credit Facility [Member] | Term Loans [Member]                
Credit Facility [Abstract]                
Maximum borrowing capacity $ 25,000,000   $ 25,000,000          
Quarterly principal payments     $ 781,250          
Interest rate at end of period 3.12%   3.12%       2.94%  
Summarized information about the term loan [Abstract]                
Principal amount of term loan $ 21,094,000   $ 21,094,000       $ 23,438,000  
Unamortized financing fees (339,000)   (339,000)       (391,000)  
Net carrying amount of term loan 20,755,000   20,755,000       23,047,000  
Less current portion of term loan (3,064,000)   (3,064,000)       (3,067,000)  
Long-term portion of term loan 17,691,000   17,691,000       19,980,000  
Future repayments of the Term Loan, by fiscal year [Abstract]                
2017 - remaining three months 781,000   781,000          
2018 3,125,000   3,125,000          
2019 3,125,000   3,125,000          
2020 3,125,000   3,125,000          
2021 10,938,000   10,938,000          
Total payments $ 21,094,000   $ 21,094,000       $ 23,438,000  
Credit Facility [Member] | Revolving Facility [Member]                
Credit Facility [Abstract]                
Maximum borrowing capacity         $ 120,000,000 $ 100,000,000    
Interest rate at end of period 4.09%   4.09%       3.53%  
Future repayments of the Term Loan, by fiscal year [Abstract]                
Outstanding balance under revolving loan $ 18,001,000   $ 18,001,000       $ 7,000,000  
Amount available under revolving facility 101,139,000   101,139,000          
Credit Facility [Member] | Revolving Facility [Member] | Letters of Credit [Member]                
Credit Facility [Abstract]                
Maximum borrowing capacity 15,000,000   15,000,000   $ 15,000,000      
Credit Facility [Member] | Revolving Facility [Member] | Commercial Letters of Credit [Member]                
Future repayments of the Term Loan, by fiscal year [Abstract]                
Outstanding balance under revolving loan 600,000   600,000          
Credit Facility [Member] | Revolving Facility [Member] | Standby Letters of Credit [Member]                
Future repayments of the Term Loan, by fiscal year [Abstract]                
Outstanding balance under revolving loan 260,000   260,000          
WX Agreement [Member] | Supplier Warrant [Member]                
WX Agreement [Abstract]                
Number of shares that can be purchased under warrants (in shares)               516,129
Initial exercise price (in dollars per share)               $ 7.75
Fair value of warrants issued 9,916,000   9,916,000       $ 15,643,000  
Total gain (loss) included in net loss $ 962,000 $ (1,275,000) $ 5,727,000 $ (3,017,000)