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Stock-Based Compensation - Summary of Option and RSU Activity (Details) - Equity Incentive Plan2010 [Member]
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Shares Available for Grant  
Balance at the beginning of the year (in shares) 231,000
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) 184,000
Number of Shares  
Balance at the beginning of the year (in shares) 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) 345,000
Weighted Average Exercise Prices  
Weighted-average exercise price (in dollars per share) | $ / shares $ 4.81
Options granted (in dollars per share) | $ / shares 1.28
Options cancelled and returned to Plan (in dollars per share) | $ / shares 23.47
Weighted-average exercise price (in dollars per share) | $ / shares $ 4.30
Options  
Shares Available for Grant  
Additional shares authorized 50,000
RSU's  
Shares Available for Grant  
RSUs cancelled and returned to Plan (in shares) 1,000
RSUs granted (in shares) (60,000)
Number of Shares  
RSUs cancelled and returned to Plan (in shares) (1,000)
Weighted Average Exercise Prices  
RSUs cancelled and returned to Plan (in dollars per shares) | $ / shares $ 0.94
RSUs granted (in dollars per share) | $ / shares $ 1.16