Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Property and equipment, accumulated depreciation $ 45,678 $ 40,530
Redeemable Convertible Preferred Stock, par value (in dollars per share) $ 0.001 $ 0.001
Redeemable Convertible Preferred Stock, shares authorized 50,000,000 50,000,000
Redeemable Convertible Preferred Stock, shares issued 0 6,864,000
Redeemable Convertible Preferred Stock, shares outstanding 0 6,864,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 81,632,045 80,462,574
Common stock, shares outstanding 81,632,045 80,462,574