Quarterly report pursuant to Section 13 or 15(d)

Net Income per Share - Additional Information (Details)

v3.8.0.1
Net Income per Share - Additional Information (Details) - $ / shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
May 23, 2017
Earnings Per Share [Abstract]      
Shares excluded from dilutive shares outstanding because their effect was anti-dilutive (in shares) (659,745) (729,637)  
Warrants strike price (in dollars per share)     $ 57.58