Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Preferred stock, par value (usd per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized 375,000,000 375,000,000
Common stock, shares issued 95,165,344 94,835,320
Common stock, shares outstanding 92,111,710 91,781,686
Treasury stock, shares 3,053,634 3,053,634