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Consolidated Statements of Stockholders' Equity (Parenthetical) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Shares forfeited for tax obligations 19,991 18,385
Common Stock [Member]    
Shares forfeited for tax obligations 19,991 18,385
Additional Paid-in Capital [Member]    
Shares forfeited for tax obligations 19,991 18,385