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Consolidated Balance Sheets (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Preferred stock, Par Value $ 0.001 $ 0.001
Preferred Stock, Shares Authorized 0 10,000,000
Preferred Stock, Shares Issued   0
Preferred Stock, Shares Outstanding   0
Common Stock, Par Value   $ 0.001
Common Stock, Shares Authorized   150,000,000
Common Stock, Shares Authorized Unlimited  
Common Stock, Shares, Issued 20,178,226 25,827,860
Common Stock, Shares, Outstanding 20,178,226 25,827,860