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Share Based Awards - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 23, 2018
Dec. 29, 2016
Aug. 11, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Aug. 31, 2015
Oct. 31, 2005
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Outstanding stock options       3,571,775   3,571,775   3,670,170    
Weighted-average grant date fair value per share of stock options           $ 7.18 $ 5.59      
Fair value of options vested           $ 3,335,000 $ 2,154,000      
Total share-based compensation       $ 4,698,000 $ 3,453,000 $ 11,949,000 8,585,000      
Percentage of performance stock units tied to 3-year total shareholder return           34.00%        
Percentage of performance stock units tied to fiscal year 2021 revenue           33.00%        
Percentage performance stock units tied to fiscal year 2021 adjusted earnings per share goals           33.00%        
Employee Stock Options                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Outstanding stock options       3,210,955   3,210,955        
Total unrecognized compensation costs       $ 9,928,000   $ 9,928,000        
Stock option recognized over weighted average period (in years)           2 years 6 months        
Restricted Stock                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number       1,871,428   1,871,428   1,820,910    
Stock option recognized over weighted average period (in years)           1 year 9 months 18 days        
Total share-based compensation       $ 3,168,000 2,333,000 $ 7,921,000 6,079,000      
Total unrecognized compensation costs       23,305,000   $ 23,305,000        
Share-based compensation arrangement by share-based payment award, options, grants in period, net of forfeitures           859,345        
Restricted Stock | Minimum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Vesting period           1 year        
Restricted Stock | Maximum                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Vesting period           3 years        
Performance Shares                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares granted   123,082                
Total share-based compensation       74,000   $ 215,000        
Vesting period           4 years        
Performance Stock Unit Awards                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Total share-based compensation       $ 230,000            
Share-based compensation arrangement by share-based payment award, options, grants in period, net of forfeitures 248,140                  
Percentage of shares issued, minimum 50.00%                  
Percentage of shares issued, maximum 200.00%                  
2005 Employee Stock Option and Incentive Plan                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Common stock reserved for issuance                   4,800,000
Outstanding stock options       360,820   360,820        
2005 Employee Stock Option and Incentive Plan | Employee Stock Options                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Expiration period (in years)           10 years        
Share-based compensation award plan , expiration date           May 25, 2015        
2015 Plan                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Common stock reserved for issuance       6,000,000   6,000,000        
Common stock reserved                 11,500,000  
Shares available for future grant       6,590,965   6,590,965        
2015 Plan | Employee Stock Options                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Expiration period (in years)           10 years        
Number of shares granted           326,130        
2015 Plan | Performance Shares                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number       55,415   55,415        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number       55,415   55,415        
Employee Share Purchase Plan                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Common stock reserved for issuance     4,000,000 3,563,985   3,563,985        
Total share-based compensation       $ 123,000 $ 88,000 $ 355,000 $ 265,000      
Maximum percentage of gross payroll deduction     15.00%              
Purchase price as a percentage of fair market value     90.00%              
Maximum shares purchase in a single transaction     1,500              
Maximum amount purchased in a calendar year     $ 25,000              
Shares issued       436,015   436,015