Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.8.0.1
Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 28,183,218 27,895,671
Common stock, shares outstanding (in shares) 25,734,222 27,895,671
Preferred stock, par value (in dollars per share) $ 0.0001  
Preferred stock, shares authorized (in shares) 15,000,000  
Preferred stock, shares issued (in shares) 0  
Treasury stock (in shares) 2,448,996