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Stock-Based Compensation - Narrative (Details)
1 Months Ended 12 Months Ended
Jan. 01, 2017
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Aug. 31, 2016
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Aug. 23, 2016
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Feb. 29, 2016
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May 31, 2015
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Jun. 30, 2014
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Jun. 30, 2010
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Dec. 31, 2017
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Dec. 31, 2016
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Dec. 31, 2015
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Dec. 31, 2014
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Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Shares authorized and unissued               231,000 114,000 106,000 176,000
Options granted (in shares)               160,000 384,000 154,000  
Options expired in relation to the Offer     456,995           58,000    
Shares issued in Replacement Offering     334,027         160,000 384,000 154,000  
Shares eligible for purchase via options     113,531                
Vesting period of replacement options     3 years                
Incremental charge resulting from the plan modification | $     $ 926,000                
Amortization period of incremental charge     3 years                
Increase in number of shares reserved for issuance               250,000 50,000 50,000  
Options                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Unamortized compensation cost, net of expected forfeitures | $               $ 1,000,000      
Weighted average expected period over which the expense is to be recognized               2 years 4 months 24 days      
Fair value of vested options and awards | $               $ 600,000      
Tax benefits associated with exercise of stock options | $               0 $ 0 $ 0  
Intrinsic value of awards exercised | $               0 $ 0 $ 300,000  
RSU's                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Unamortized compensation cost, net of expected forfeitures | $               $ 600,000      
Weighted average expected period over which the expense is to be recognized               1 year 1 month 6 days      
Employee stock purchase plan                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Shares authorized and unissued               150,000      
Number of shares reserved for issuance             200,000        
Increase in number of shares reserved for issuance         200,000            
Number of offering periods | item             2        
Offering period             6 months        
Purchase price to be paid by participants as a percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less             85.00%        
Shares of common stock issued under the plan   31,900   37,300              
Aggregate purchase price of shares issued | $   $ 167,000   $ 197,000              
Employee stock purchase plan | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Maximum amount of shares that eligible employee may purchase annually (in dollars) | $             $ 25,000        
Equity Incentive Plan2010 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Term of Plan               10 years      
Number of shares reserved for issuance                     400,000
Increase in number of shares reserved for issuance 50,000                    
Equity Incentive Plan2010 [Member] | Options                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Maximum annual option grants or other awards to the entity's non-employee directors (in shares)               40,000      
Maximum one-time grant of an option or other awards to the entitiy's non employee directors (in shares) | $               $ 120,000      
Maximum term of options granted               10 years      
Minimum percentage of voting rights required for applicability of a specific expriation term               10.00%      
Maximum expiration term of options granted               5 years      
Vesting period of replacement options               4 years      
Increase in number of shares reserved for issuance           150,000         200,000
Equity Incentive Plan2010 [Member] | Options | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Term of Plan               6 years      
Equity Incentive Plan2010 [Member] | Options | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Term of Plan               10 years      
Equity Incentive Plan2010 [Member] | RSU's                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Total intrinsic value of the restricted stock units outstanding | $               $ 400,000      
Amended2000 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]                      
Shares authorized and unissued               0 0