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Stock-based Compensation (Details 3) - Restricted Stock Units [Member]
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]  
Balance at beginning | shares 287,885
Granted | shares 75,732
Vested | shares (187,128) [1]
Forfeited | shares (3,577)
Balance at ending | shares 172,912
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Balance at beginning | $ / shares $ 1.86
Granted | $ / shares 1.62
Vested | $ / shares 2.56
Forfeited | $ / shares 6.99
Balance at ending | $ / shares $ 0.98
[1] In February 2018, the Company net issued 32,625 shares of common stock to a former employee of the Company under the employee?s separation agreement, which accelerated the vesting of certain restricted stock units.