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Stock Incentive Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of award vesting terms for RSUs granted

The following table summarizes the award vesting terms for the RSUs granted on January 1, 2018:

 

Number of RSUs  Target price 
902  $11.00 
15,000  $12.50 
15,000  $14.00 

  

The following table summarizes the award vesting terms for the RSUs granted on March 17, 2017:

 

Number of RSUs  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%
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 and

board

shares

issued

  

Number of

RSUs

outstanding

 
At January 1, 2018   274,494    125,564   $19.53    97,692    22,384 
Granted   (36,953)   —    —    1,878    35,075 
Exercised/issued   —    —    —    —    (3,477)
Cancelled/forfeited   65,902    (62,919)   32.64    —    (2,983)
At September 30, 2018   303,443    62,645   $12.54    99,570    50,999 
Schedule of non-vested options
   Options  

Weighted-

average

exercise

price

 
Non-vested options at January 1, 2018   46,842   $8.26 
Granted   —    — 
Vested   (7,942)   6.97 
Forfeited   (23,813)   9.07 
Non-vested options at September 30, 2018   15,087   $7.66 
Summary of restricted stock units
  

RSUs

outstanding

  

Weighted average
price at

time of
grant

  

Aggregate intrinsic

value

 
Non-vested RSUs as of January 1, 2018   22,384   $4.65         
Granted    35,075    7.89      
Vested    (3,477)   7.05      
Cancelled    (2,983)   8.88      
Non-vested RSUs at September 30, 2018    50,999   $6.46   $329,614 
Restricted stock [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, 2018   4,904 
Granted   1,878 
Vested   (4,328)
Non-vested restricted stock as of September 30, 2018   2,454