Quarterly report pursuant to Section 13 or 15(d)

Stock Options - Additional Information (Details)

v3.10.0.1
Stock Options - Additional Information (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Weighted average grant-date fair value of options granted $ 3.98 $ 6.02
Stock options vested aggregate intrinsic value $ 3,778,754 $ 3,596,624
Stock options expected to vest aggregate intrinsic value 3,449,919 1,469,154
Total unrecognized compensation cost related to unvested stock options and restricted stock granted under the Company's equity plans $ 3,244,431 $ 2,453,342
Unrecognized compensation cost related to unvested stock options and restricted stock granted under the Company's equity plans, period for recognition 3 years