Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

v3.10.0.1
Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2018
Dec. 31, 2017
Stock Transactions, Parenthetical Disclosures [Abstract]    
Preferred stock, par value (dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (shares) 10,000,000 10,000,000
Preferred stock, shares issued (shares) 0 0
Preferred stock, shares outstanding (shares) 0 0
Common stock, par value (dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (shares) 100,000,000 100,000,000
Common stock, shares issued (shares) 54,685,759 53,931,167
Common stock, shares outstanding (shares) 48,083,063 48,606,425