Annual report pursuant to Section 13 and 15(d)

Income Taxes- NOL and tax credits (Details)

v3.4.0.3
Income Taxes- NOL and tax credits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
NOL and tax credit carry forwards for federal and state income tax purposes      
Period of time from grant date during which a tax benefit may be generated from a premature disposition of option shares exercised 2 years    
Period of time from exercise date during which a tax benefit may be generated from a premature disposition of option shares exercised 1 year    
Federal and state NOL carryforwards generated by disqualifying dispositions of stock options and exercises of nonqualified stock options $ 27,700    
Tax benefits associated with the stock options excluded from the provision for income taxes and credited directly to additional paid-in-capital 9,700    
Other disclosures      
Interest or penalties related to unrecognized tax benefits 0 $ 0  
Unrecognized tax benefits, that if recognized, would affect the effective tax rate 2,700 2,600  
Reconciliation of the beginning and ending amount of total gross unrecognized tax benefits      
Balance at the beginning of the period 2,564 2,441 $ 2,418
Gross decrease related to prior year tax positions     (93)
Gross increase related to prior year tax positions 13 11 1
Gross increase related to current year tax positions 124 112 115
Balance at the end of the period 2,701 2,564 $ 2,441
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    
Federal      
NOL and tax credit carry forwards for federal and state income tax purposes      
Deferred tax assets related to research and development credits 9,900 9,500  
NOL 652,385    
Tax credit carry forwards 9,940    
State      
NOL and tax credit carry forwards for federal and state income tax purposes      
Deferred tax assets related to research and development credits 9,700 $ 9,200  
NOL 180,610    
Tax credit carry forwards $ 9,471