Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Contract Balances and Practical Expedients (Details)

v3.10.0.1
Revenue Recognition - Contract Balances and Practical Expedients (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Increase (decrease) in balance of deferred revenue $ 200  
Increase in deposits 400  
Changes in deferred revenue    
DSS program 626  
Deposits 1,597  
Deferred revenue balance, end of the period $ 6,781 $ 6,600
Practical expedient to disclose only the value of unsatisfied performance obligations for contracts with an original expected length greater than one year true  
Practical expedient to expense costs as incurred for costs to obtain a contract when the amortization period would have been one year or less true  
FPP agreements    
Disaggregation of Revenue [Line Items]    
Increase (decrease) in balance of deferred revenue $ 1,100  
Changes in deferred revenue    
FPP Balance, beginning of the period 3,549  
FPP Billings 8,087  
FPP Revenue recognized (7,078)  
Balance attributed to FPP contracts 4,558  
Estimated revenue to be recognized in the next 12 months 3,300  
Distributor Support System    
Disaggregation of Revenue [Line Items]    
Increase (decrease) in balance of deferred revenue $ (500)