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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
CONSOLIDATED BALANCE SHEETS    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, authorized shares 5,000,000 5,000,000
Preferred stock, issued shares 0 0
Preferred stock, outstanding shares 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized shares 100,000,000 100,000,000
Common stock, issued shares 33,678,840 33,265,629
Common stock, outstanding shares 33,678,840 33,265,629