Annual report pursuant to Section 13 and 15(d)

RESTATEMENT OF PREVIOUSLY ISSUED CONSOLIDATED FINANCIAL STATEMENTS - Consolidated Balance Sheets (Details)

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RESTATEMENT OF PREVIOUSLY ISSUED CONSOLIDATED FINANCIAL STATEMENTS - Consolidated Balance Sheets (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Deferred income tax liability $ 2,863,098 $ 2,399,976    
Total long-term liabilities 13,487,116 15,785,419    
Total liabilities 41,187,928 42,104,213    
Accumulated deficit (176,498,057) (178,368,012)    
Total equity 76,775,717 74,293,963 $ 65,085,046 $ 64,047,371
Total liabilities and stockholders’ equity $ 117,963,645 116,398,176    
Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Deferred income tax liability   5,600,721    
Total long-term liabilities   18,986,164    
Total liabilities   45,304,958    
Accumulated deficit   (181,568,757)    
Total equity   71,093,218    
Total liabilities and stockholders’ equity   $ 116,398,176