XML 51 R40.htm IDEA: XBRL DOCUMENT v3.19.1
Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock-based compensation expense    
Total stock based compensation expense $ 200,067 $ 1,406,131
Options vested, fair value 188,984 971,488
Research and Development Expense    
Stock-based compensation expense    
Total stock based compensation expense 110,081 395,709
Cost of Revenue    
Stock-based compensation expense    
Total stock based compensation expense 0 39,631
Selling, general and administrative expense    
Stock-based compensation expense    
Total stock based compensation expense 89,986 970,791
Stock Option    
Stock-based compensation expense    
Unrecognized compensation cost $ 165,954 $ 2,662,066
Weighted-average remaining vesting period for recognition 9 months 29 days 1 year 9 months 15 days
Options outstanding, weighted average contractual life 7 years 2 months 9 days