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Employee Stock Purchase Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 30, 2017
Jan. 03, 2017
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award          
Closing price   $ 1.30      
$1.02 per share          
Share-based Compensation Arrangement by Share-based Payment Award          
Closing price     $ 1.19    
$2.38 per share          
Share-based Compensation Arrangement by Share-based Payment Award          
Closing price     1.19    
$1.20 per share          
Share-based Compensation Arrangement by Share-based Payment Award          
Closing price     $ 2.08    
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Number of shares authorized to be purchased under Employee Stock Purchase Plan (in shares)     1,000,000    
Employee Stock Purchase Plan, maximum annual contribution per employee, percent     10.00%    
Employee Stock Purchase Plan, percent of fair market value, prior year     85.00%    
Employee Stock Purchase Plan, percent of fair market value, current year     85.00%    
Shares remaining available for grant (in shares)     502,547    
Allocated share-based compensation expense     $ 5 $ 20  
Cash received from purchase of shares under Employee Stock Purchase Plan     $ 26 $ 115  
Employee Stock Purchase Plan | $1.02 per share          
Share-based Compensation Arrangement by Share-based Payment Award          
Stock purchased during period, shares, Employee Stock Purchase Plan (in shares)     25,617    
Stock purchased during period, price per share, Employee Stock Purchase Plan (in USD per share)     $ 1.02    
Employee Stock Purchase Plan | $2.38 per share          
Share-based Compensation Arrangement by Share-based Payment Award          
Stock purchased during period, shares, Employee Stock Purchase Plan (in shares)       27,071  
Stock purchased during period, price per share, Employee Stock Purchase Plan (in USD per share)       $ 2.38  
Employee Stock Purchase Plan | $1.20 per share          
Share-based Compensation Arrangement by Share-based Payment Award          
Stock purchased during period, shares, Employee Stock Purchase Plan (in shares)         42,050
Stock purchased during period, price per share, Employee Stock Purchase Plan (in USD per share)         $ 1.20
Scenario, Forecast | Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Purchase price discount 85.00%