Quarterly report pursuant to Section 13 or 15(d)

Benefit Plans - Stock Options Activity Under Share-Based Payment Plans (Details)

v3.8.0.1
Benefit Plans - Stock Options Activity Under Share-Based Payment Plans (Details) - Employees And Non Employee Stock Option
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Options  
Outstanding as of beginning of period (in shares) | shares 332,648
Granted (in shares) | shares 27,218
Exercised (in shares) | shares (65,413)
Forfeited, cancelled or expired (in shares) | shares (4,551)
Outstanding as of end of period (in shares) | shares 289,902
Exercisable (in shares) | shares 128,288
Weighted- Average Exercise Price Per Share  
Outstanding as of beginning of period (in dollars per share) | $ / shares $ 3.50
Granted (in dollars per share) | $ / shares 5.49
Exercised (in dollars per share) | $ / shares 3.20
Forfeited, cancelled or expired (in dollars per share) | $ / shares 3.90
Outstanding as of end of period (in dollars per share) | $ / shares 3.75
Exercisable (in dollars per share) | $ / shares $ 3.16
Weighted- Average Remaining Contractual Term (Years)  
Outstanding 6 years 10 months 14 days
Exercisable 5 years 8 months 2 days
Aggregate Intrinsic Value  
Outstanding | $ $ 513,625
Exercisable | $ $ 302,230