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INVESTMENTS (Tables)
 3 Months Ended
Jun. 30, 2016
INVESTMENTS [Abstract]  
Available-for-sale and Held-to-maturity Investments
The following table summarizes available-for-sale and held-to-maturity investments as of June 30, 2016 and March 31, 2016 (in thousands).

  
Available-for-Sale Investments
 
June 30, 2016
 
Amortized
Cost
  
Gross
Unrealized
Gain
  
Gross
Unrealized
(Loss)
  
Fair
Value
 
Corporate bonds
 
$
6,025
  
$
5
  
$
(2
)
 
$
6,028
 
Total available-for-sale investments
 
$
6,025
  
$
5
  
$
(2
)
 
$
6,028
 

  
Held-to-Maturity Investments
 
June 30, 2016
 
Amortized
Cost
  
Gross
Unrecognized
Gain
  
Gross
Unrecognized
(Loss)
  
Fair
Value
 
Certificates of deposit
 
$
2,737
  
$
2
  
$
-
  
$
2,739
 
Commercial paper
  
16,453
   
4
   
(3
)
  
16,454
 
Corporate bonds
  
40,519
   
3
   
(85
)
  
40,437
 
Total held-to-maturity investments
 
$
59,709
  
$
9
  
$
(88
)
 
$
59,630
 
 
  
Available-for-Sale Investments
 
March 31, 2016
 
Amortized
Cost
  
Gross
Unrealized
Gain
  
Gross
Unrealized
(Loss)
  
Fair
Value
 
Corporate bonds
 
$
7,037
  
$
-
  
$
(12
)
 
$
7,025
 
Total available-for-sale investments
 
$
7,037
  
$
-
  
$
(12
)
 
$
7,025
 

  
Held-to-Maturity Investments
 
March 31, 2016
 
Amortized
Cost
  
Gross
Unrecognized
Gain
  
Gross
Unrecognized
(Loss)
  
Fair
Value
 
Certificates of deposit
 
$
2,737
  
$
3
  
$
-
  
$
2,740
 
Commercial paper
  
12,455
   
-
   
(6
)
  
12,449
 
Corporate bonds
  
41,715
   
-
   
(117
)
  
41,598
 
Total held-to-maturity investments
 
$
56,907
  
$
3
  
$
(123
)
 
$
56,787
 
Amortized Cost and Fair Value of Investments, Classified by Stated Maturity
The following table summarizes the amortized cost and fair value of our investments, classified by stated maturity as of June 30, 2016 and March 31, 2016 (in thousands).

  
June 30, 2016
  
June 30, 2016
 
  
Available-for-Sale Investments
  
Held-to-Maturity Investments
 
  
Amortized Cost
  
Fair Value
  
Amortized Cost
  
Fair Value
 
Due in less than one year
 
$
5,020
  
$
5,019
  
$
43,638
  
$
43,623
 
Due in 1 to 4 years
  
1,005
   
1,009
   
16,071
   
16,007
 
Total investments
 
$
6,025
  
$
6,028
  
$
59,709
  
$
59,630
 

  
March 31, 2016
  
March 31, 2016
 
  
Available-for-Sale Investments
  
Held-to-Maturity Investments
 
  
Amortized Cost
  
Fair Value
  
Amortized Cost
  
Fair Value
 
Due in less than one year
 
$
4,314
  
$
4,311
  
$
37,163
  
$
37,128
 
Due in 1 to 4 years
  
2,723
   
2,714
   
19,744
   
19,659
 
Total investments
 
$
7,037
  
$
7,025
  
$
56,907
  
$
56,787