Annual report pursuant to Section 13 and 15(d)

Income Taxes - NOL and tax credits (Details)

v3.7.0.1
Income Taxes - NOL and tax credits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Other disclosures        
Total amount of unrecognized tax benefits $ 2,701 $ 2,564 $ 2,825 $ 2,701
Interest or penalties related to unrecognized tax benefits     0 0
Unrecognized tax benefits, that if recognized, would affect the effective tax rate     2,800 2,700
Reconciliation of the beginning and ending amount of total gross unrecognized tax benefits        
Balance at the beginning of the period 2,701 2,564    
Gross increase related to prior year tax positions   13    
Gross increase related to current year tax positions 124 124    
Balance at the end of the period 2,825 2,701    
Maximum        
NOL and tax credit carry forwards for federal and state income tax purposes        
Annual limitation amount on utilization of the NOLs and tax credits     57,300  
Research and development        
Other disclosures        
Total amount of unrecognized tax benefits 2,700 2,700 2,800 2,700
Reconciliation of the beginning and ending amount of total gross unrecognized tax benefits        
Balance at the beginning of the period 2,700      
Balance at the end of the period $ 2,800 $ 2,700    
Federal        
NOL and tax credit carry forwards for federal and state income tax purposes        
NOL     677,995  
Tax credit carry forwards     10,093  
Deferred tax assets related to research and development credits     10,200 9,800
State        
NOL and tax credit carry forwards for federal and state income tax purposes        
NOL     160,223  
Tax credit carry forwards     9,692  
Deferred tax assets related to research and development credits     $ 9,900 $ 9,500