Annual report pursuant to Section 13 and 15(d)

Stock Option Plan - Narrative (Details)

v3.7.0.1
Stock Option Plan - Narrative (Details)
 12 Months Ended
May 17, 2013
shares
Dec. 31, 2016
USD ($)
tranche
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility rate   55.00% 60.00%
Risk free interest rate   1.55% 1.74%
Fair value of restricted stock     $ 0
Cost of shares purchased to cover federal and state taxes due   $ 3,258  
Options exercised (in shares) | shares   10,352 265,484
Net cash proceeds for exercise of options   $ 35,533  
Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of restricted stock     $ 10
Options exercised (in shares) | shares   10,352 265,484
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Life of PSUs   5 years 3 months 22 days 5 years 3 months 22 days
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Life of PSUs   6 years 3 months 6 years 3 months
2013 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum reserved shares of common stock for issuance under the Plan (in shares) | shares 839,983    
Increase in shares available for issuance under the Plan (in shares) | shares     1,250,000
Shares of common stock available for issuance under the Plan (in shares) | shares   655,127  
Stock options granted (in shares) | shares   96,138 221,102
Value of options granted   $ 294,132  
Stock compensation expense related to grant of restricted stock   $ 19,425 $ 7,284
Options exercised (in shares) | shares   4,607 201,389
Net cash proceeds for exercise of options   $ 23,035  
Estimated aggregate pretax intrinsic value   92,186  
Unrecognized compensation cost related to non-vested share-based compensation arrangements   $ 2,609,715  
Weighted average period for recognition   2 years 2 months 12 days  
2013 Equity Incentive Plan | Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested restricted stock (in shares) | shares   7,500 7,500
2013 Equity Incentive Plan | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of options issued under the Plan 10 years    
Vesting period   4 years  
Compensation expense associated with grants   $ 160,519  
Fair value of restricted stock     $ 77,700
2013 Equity Incentive Plan | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   4 years  
Awards granted (in shares) | shares   119,000  
Number of tranches of market-based vesting criteria | tranche   4  
Grant-date fair value of PSUs   $ 429,293  
Grant-date fair value per unit (in dollars per share) | $ / shares   $ 3.61  
Life of PSUs   4 years  
Volatility rate   55.00%  
Risk free interest rate   1.53%  
Compensation expense for PSUs   $ 107,323  
2013 Equity Incentive Plan | PSUs | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock price targets (in dollars per share) | $ / shares   $ 10  
2013 Equity Incentive Plan | PSUs | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock price targets (in dollars per share) | $ / shares   $ 16  
2013 Equity Incentive Plan | Restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   4 years  
Awards granted (in shares) | shares     10,000
Shares purchased to cover federal and state taxes due (in shares) | shares   683  
Cost of shares purchased to cover federal and state taxes due   $ 3,258  
2013 Equity Incentive Plan | Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted (in shares) | shares   58,200  
2013 Equity Incentive Plan | Employees | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
2013 Equity Incentive Plan | Non-employee directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted (in shares) | shares   37,938  
2013 Equity Incentive Plan | Non-employee directors | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year