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Stock-Based Compensation - Summary of Option and RSU Activity (Details) - Equity Incentive Plan2010 [Member] - $ / shares
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Shares Available for Grant        
Balance at the beginning of the year (in shares) 185,000 184,000 231,000 231,000
Options granted (in shares)     (40,000)  
Options cancelled and returned to Plan (in shares) 6,000 1,000 2,000  
Balance at the end of the period (in shares) 10,000 185,000 184,000 185,000
Number of Shares        
Balance at the beginning of the year (in shares) 344,000 345,000 307,000 307,000
Options granted (in shares)     40,000  
Options cancelled and returned to Plan (in shares)     2,000  
Balance at the end of the period (in shares) 338,000 344,000 345,000 344,000
Options cancelled and returned to Plan (in shares) 6,000 1,000 2,000  
Weighted Average Exercise Prices        
Weighted-average exercise price (in dollars per share) $ 4.27 $ 4.30 $ 4.81 $ 4.81
Options granted (in dollars per share)     1.28  
Options cancelled and returned to Plan (in dollars per share) 8.52 9.40 23.47  
Weighted-average exercise price (in dollars per share) $ 4.20 $ 4.27 $ 4.30 $ 4.27
Options        
Shares Available for Grant        
Additional shares authorized     50,000  
RSU's        
Shares Available for Grant        
RSUs granted (in shares) (208,000)   (60,000) (60,000)
RSUs cancelled and returned to Plan (in shares) 27,000   1,000 1,000
Number of Shares        
RSUs cancelled and returned to Plan (in shares) (27,000)   (1,000) (1,000)
Weighted Average Exercise Prices        
RSUs granted (in dollars per share) $ 0.81     $ 1.16
RSUs cancelled and returned to Plan (in dollars per shares) $ 1.26     $ 0.94