Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jul. 31, 2017
Additional disclosure            
Stock-based compensation expense   $ 224 $ 153 $ 451 $ 307  
Employee Stock Purchase Plan            
Weighted Average Grant-Date Fair Value            
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 and performance restricted stock units            
Shares            
Nonvested, balance at the beginning of the period (in shares)       2,011,611    
Granted (in shares)       634,856    
Vested and issued (in shares)       (465,165)    
Forfeited (in shares)       (32,945)    
Nonvested, balance at the end of the period (in shares)   2,148,357   2,148,357    
Awards expected to vest (in shares)   2,148,334   2,148,334    
Weighted Average Grant-Date Fair Value            
Nonvested restricted stock units outstanding at the beginning of the period (in dollars per share)       $ 0.90    
Granted (in dollars per share)       1.36    
Vested and issued (in dollars per share)       0.88    
Forfeited (in dollars per share)       0.86    
Nonvested restricted stock units outstanding at the end of the period (in dollars per share)   $ 1.04   1.04    
Awards expected to vest (in dollars per share)   $ 1.04   $ 1.04    
Restricted stock units            
Additional disclosure            
Stock-based compensation expense   $ 224 144 $ 451 287  
Aggregate fair value of restricted stock units vested and issued   516 $ 130 523 $ 137  
Unrecognized compensation cost   $ 1,800   $ 1,800    
Weighted average period for recognizing compensation cost       2 years 1 month 6 days    
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share)   $ 1.14 $ 0.62 $ 1.36 $ 0.67  
Restricted stock units | Awards vesting on the second year anniversary            
Additional disclosure            
Vesting period       2 years    
Awards vesting percentage       100.00%    
Vesting period of awards after issuance date       2 years    
Restricted stock units | Awards vesting one-third annually            
Additional disclosure            
Vesting period       3 years    
Awards vesting percentage       33.33%    
Vesting period of awards after issuance date       1 year    
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    
Performance Restricted Stock Units            
Additional disclosure            
Stock-based compensation expense       $ 0    
Aggregate fair value of restricted stock units vested and issued       $ 0    
Performance goal payment as a percentage of target   50.00%   50.00%    
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share)       $ 1.59    
Performance Restricted Stock Units | Maximum            
Additional disclosure            
Performance goal payment as a percentage of target   150.00%   150.00%    
Performance Restricted Stock Units | Three-year performance measurement period            
Additional disclosure            
Performance measurement period       3 years    
Shares            
Granted (in shares)       147,327    
PRSU Program | Two-year performance measurement period            
Additional disclosure            
Performance measurement period       2 years    
PRSU Program | Three-year performance measurement period            
Additional disclosure            
Performance measurement period       3 years    
Restricted Stock Awards            
Additional disclosure            
Stock-based compensation expense     $ 1   $ 3  
Shares            
Granted (in shares)   0 1,953 0 3,969  
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share)     $ 0.64   $ 0.63  
Non-employee director | Restricted stock units            
Additional disclosure            
Vesting period       1 year    
Chief Executive Officer | Restricted stock units | Two-year performance measurement period            
Additional disclosure            
Awards vesting percentage       100.00%    
Vesting period of awards after issuance date       2 years    
Chief Executive Officer | Performance Restricted Stock Units | Two-year performance measurement period            
Additional disclosure            
Performance measurement period       2 years    
Shares            
Granted (in shares)       150,000