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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of activity of stock incentive and equity plans
   Shares
available
for grant		   Number of
options
outstanding		   Weighted-
average
option
exercise price		   Number of
restricted
stock shares
issued		   Number of
RSUs
outstanding		 
Outstanding at January 1, 2017   243,218    253,541    37.31    76,483    12,584 
Granted   (85,071)   —    —    21,209    63,862 
Exercised/issued   —    (938)   6.10    —    (53,625)
Canceled/forfeited   116,347    (127,039)   51.85    —    (437)
Outstanding at December 31, 2017   274,494    125,564    19.53    97,692    22,384 
Granted   (47,953)   10,000    —    1,878    36,075 
Exercised/issued   —    (938)   6.10    —    (5,300)
Canceled/forfeited   68,526    (65,543)   31.66    —    (2,983)
Outstanding at December 31, 2018   295,067    69,083   $12.10    99,570    50,176 
Schedule of intrinsic value calculated based on grant date fair value
Date of grant  Number of
options
granted		   Exercise
price		   Intrinsic
value
per share		 
November 2018   10,000   $7.77    — 
Schedule of exercise prices of outstanding options
Exercise price  Number of
options
outstanding		   Average
remaining
contractual life
(years)		   Number of
options
exercisable		 
$6.10 - $13.50   64,027    7.21    42,035 
$40.10 - $44.10   4,255    2.74    4,255 
$77.50 - $121.10   312    0.87    312 
$194.90 - $226.90   489    1.19    489 
    69,083    6.86    47,091 
Schedule of non-vested options
   Non-vested
options		   Weighted-
average option
exercise
price		 
Non-vested at January 1, 2017   148,983   $10.20 
Vested   (47,618)   12.89 
Cancelled   (54,523)   9.50 
Non-vested at December 31, 2017   46,842    8.26 
Granted   10,000    7.77 
Vested   (8,413)   9.04 
Cancelled   (26,437)   8.99 
Non-vested at December 31, 2018   21,992   $6.86 
Schedule of estimated fair value at the date of option grant using the Black-Scholes option-pricing model
   2018 
Weighted-average fair value per option  $6.09 
Expected term   5.1 years 
Risk-free interest rate   2.95%
Volatility   47%
Dividend yield   None 
Forfeiture rate   24.43%
Schedule of restricted stock units
Number of RSUs  Target price 
902  $11.00 
15,000  $12.50 
15,000  $14.00 

 

Number of restricted stock units  Target price 
15,000  $6.50 
15,000  $8.00 
15,000  $9.50 
14,098  $11.00 

 
Schedule of fair value of restricted stock units
   Granted 
   January
2018		   March
2017		 
Daily expected stock price volatility   4.2806%   4.4237%
Daily expected mean return on equity   (0.2575%)   (0.2226%)
Daily expected dividend yield   0.0%   0.0%
Average daily risk-free interest rate   0.0078%   0.0063%
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of restricted stock units
    RSUs
outstanding		     Weighted-average
price at
time of grant		     Aggregate intrinsic
value		  
Non-vested RSUs as of January 1, 2017     12,584     $ 16.00          
Granted     63,862       6.46          
Vested     (53,625 )     9.41          
Cancelled     (437 )     11.30          
Non-vested RSUs as of December 31, 2017     22,384       4.65          
Granted     36,075       7.88          
Vested     (5,300 )     8.51          
Cancelled     (2,983 )     8.88          
Non-vested RSUs at December 31, 2018     50,176     $ 6.31     $ 396,319  
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of restricted stock units
Non-vested restricted stock as of January 1, 2017     16,470  
Granted     21,209  
Vested     (32,775 )
Non-vested restricted stock as of December 31, 2017     4,904  
Granted     1,878  
Vested     (4,328 )
         
Non-vested restricted stock as of December 31, 2018     2,454