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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
Mar. 31, 2018
Jun. 30, 2018
Shares Available for Grant    
Balance at the beginning of the year (in shares) 231,000 231,000
Options granted (in shares) (40,000)  
Options cancelled and returned to Plan (in shares) 2,000 1,000
Balance at the end of the period (in shares) 184,000 185,000
Options cancelled and returned to Plan (in shares)   1,000
Number of Shares    
Balance at the beginning of the year (in shares) 307,000 307,000
Options granted (in shares) 40,000  
Options cancelled and returned to Plan (in shares) (2,000) (1,000)
Balance at the end of the period (in shares) 345,000 344,000
Weighted Average Exercise Prices    
Weighted-average exercise price (in dollars per share) $ 4.81 $ 4.81
Options granted (in dollars per share) 1.28  
Options cancelled and returned to Plan (in dollars per share) 23.47 9.40
Weighted-average exercise price (in dollars per share) $ 4.30 $ 4.27
Options    
Shares Available for Grant    
Additional shares authorized 50,000  
RSU's    
Shares Available for Grant    
RSUs granted (in shares) (60,000) (60,000)
RSUs cancelled and returned to Plan (in shares) 1,000 1,000
Number of Shares    
RSUs cancelled and returned to Plan (in shares) (1,000) (1,000)
Weighted Average Exercise Prices    
RSUs granted (in dollars per share)   $ 1.16
RSUs cancelled and returned to Plan (in dollars per shares)   $ 0.94