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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
May 23, 2017
Earnings Per Share [Abstract]          
Shares excluded from dilutive shares outstanding because their effect was anti-dilutive 36,028 51,156 245,009 358,992  
Warrants strike price (in dollars per share)         $ 57.58