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 9 Months Ended
Aug. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jul. 31, 2017
Additional disclosure            
Stock-based compensation expense   $ 102 $ 174 $ 409 $ 653  
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)   $ 0.89 $ 0.91 $ 0.76 $ 1.64  
Additional disclosure            
Assumed forfeiture (in shares)       0    
Stock-based compensation expense   $ 102 $ 165 $ 389 $ 540  
Aggregate fair value of restricted stock units vested and issued   19 $ 25 156 $ 132  
Unrecognized compensation cost   $ 700   $ 700    
Weighted average period for recognizing compensation cost       2 years 3 months 18 days    
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    
Restricted stock and performance restricted stock units            
Shares            
Nonvested, balance at the beginning of the period (in shares)       316,709    
Granted (in shares)       909,848    
Vested and issued (in shares)       (239,372)    
Forfeited (in shares)       (46,168)    
Nonvested, balance at the end of the period (in shares)   941,017   941,017    
Awards expected to vest (in shares)   940,994   940,994    
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)       0.76    
Vested and issued (in dollars per share)       2.63    
Forfeited (in dollars per share)       1.79    
Nonvested restricted stock units outstanding at the end of the period (in dollars per share)   $ 0.94   0.94    
Awards expected to vest (in dollars per share)   $ 0.93   $ 0.93    
Restricted Stock Awards            
Shares            
Granted (in shares)     1,389 3,969 63,500  
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share)     $ 0.90 $ 0.63 $ 1.56  
Additional disclosure            
Stock-based compensation expense     $ 1 $ 3 $ 102  
Non-employee director | Restricted stock units            
Additional disclosure            
Vesting period       1 year