Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Restricted Stock Units and Performance Restricted Stock Units (Details)

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Stockholders' Equity - Restricted Stock Units and Performance Restricted Stock Units (Details)
1 Months Ended 12 Months Ended
May 31, 2014
item
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Jun. 30, 2000
shares
Additional disclosure        
Share based compensation expenses | $   $ 810,000 $ 2,570,000  
Purchase Plan        
Additional disclosure        
Number of shares of common stock reserved for issuance       70,000
Maximum amount that can be contributed by the employee | $   $ 25,000    
Maximum percentage of regular compensation that can be contributed by the employee   15.00%    
Percentage of the fair market value of common stock on the last day of the purchase right period   95.00%    
Number of shares issued under purchase plan   10,063 5,658  
Number of shares available for future grant   4,757    
Restricted stock units        
Shares        
Nonvested, balance at the end of the period (in shares)   14,820    
Additional disclosure        
Assumed forfeiture (in shares)   0    
Vesting period   4 years    
Share based compensation expenses | $   $ 686,000 $ 891,000  
Aggregate fair value of restricted stock units vested and issued | $   $ 132,000 $ 346,000  
Weighted average grant date fair value of options granted during the period (in dollars per share) | $ / shares   $ 1.64 $ 3.34  
Unrecognized compensation cost | $   $ 500,000    
Weighted average period for recognizing compensation cost   1 year 6 months    
Restricted stock units | Awards vesting over four years with one-fourth units vesting one year after the issuance date        
Additional disclosure        
Vesting period   1 year    
Awards vesting percentage   25.00%    
PRSU Program        
Shares        
Granted (in shares)   0    
Weighted Average Grant-Date Fair Value        
Granted (in dollars per share) | $ / shares     $ 15.50  
Additional disclosure        
Share based compensation expenses | $   $ 0    
Restricted stock and performance restricted stock units        
Shares        
Nonvested, balance at the beginning of the period (in shares)   256,787    
Granted (in shares)   230,439    
Vested and issued (in shares)   (96,111)    
Forfeited (in shares)   (74,406)    
Nonvested, balance at the end of the period (in shares)   316,709 256,787  
Awards expected to vest (in shares)   316,686    
Weighted Average Grant-Date Fair Value        
Nonvested restricted stock units outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 6.53    
Granted (in dollars per share) | $ / shares   1.64    
Vested and issued (in dollars per share) | $ / shares   8.35    
Forfeited (in dollars per share) | $ / shares   4.65    
Nonvested restricted stock units outstanding at the end of the period (in dollars per share) | $ / shares   2.85 $ 6.53  
Awards expected to vest (in dollars per share) | $ / shares   2.85    
Non-employee director | Restricted stock units        
Weighted Average Grant-Date Fair Value        
Granted (in dollars per share) | $ / shares   $ 1.59 $ 1.41  
Additional disclosure        
Vesting period   1 year    
Share based compensation expenses | $   $ 104,000 $ 431,000  
Deferred stock awards granted   65,167 305,725  
Chief Executive Officer | PRSU Program        
Additional disclosure        
Number of performance measurement periods to earn PRSU awards | item 2      
Vesting right percentage of awards that will vest after end of applicable performance measurement period 50.00%      
Vesting right percentage of awards that will vest one year after end of performance measurement period 50.00%