Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - RSU's and PRSU's (Details)

v3.8.0.1
Stock-Based Compensation - RSU's and PRSU's (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jul. 31, 2017
Additional disclosure            
Share based compensation expenses   $ 153 $ 241 $ 307 $ 479  
Employee Stock Purchase Plan            
Additional disclosure            
Number of shares available for future grant   570,000   570,000   70,000
Increase in common stock available under the plan 500,000          
Restricted stock units            
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share)   $ 0.62 $ 1.71 $ 0.67 $ 1.71  
Additional disclosure            
Assumed forfeiture (in shares)       0    
Share based compensation expenses   $ 144 $ 188 $ 287 $ 375  
Aggregate fair value of restricted stock units vested and issued   130 $ 85 137 $ 107  
Unrecognized compensation cost   $ 500   $ 500    
Restricted stock units | Awards vesting over four years with one-fourth units vesting one year after the issuance date            
Additional disclosure            
Vesting period       4 years    
Awards vesting percentage       25.00%    
Vesting period of awards after issuance date       1 year    
PRSU Program            
Shares            
Nonvested, balance at the beginning of the period (in shares)       316,709    
Granted (in shares)       474,848    
Vested and issued (in shares)       (212,924)    
Forfeited (in shares)       (9,513)    
Nonvested, balance at the end of the period (in shares)   569,120   569,120    
Awards expected to vest (in shares)   569,097   569,097    
Weighted Average Grant-Date Fair Value            
Nonvested restricted stock units outstanding at the beginning of the period (in dollars per share)       $ 2.85    
Granted (in dollars per share)       0.64    
Vested and issued (in dollars per share)       2.76    
Forfeited (in dollars per share)       2.49    
Nonvested restricted stock units outstanding at the end of the period (in dollars per share)   $ 1.05   1.05    
Awards expected to vest (in dollars per share)   $ 1.05   $ 1.05    
Restricted Stock Awards            
Shares            
Granted (in shares)   1,953 29,910 3,969 62,111  
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share)   $ 0.64 $ 1.69 $ 0.63 $ 1.63  
Additional disclosure            
Share based compensation expenses   $ 1 $ 50 $ 3 $ 101  
Weighted average period for recognizing compensation cost       1 year 2 months 12 days    
Non-employee director | Restricted stock units            
Additional disclosure            
Vesting period       1 year