Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
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
 6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Options  
Outstanding as of beginning of period (in shares) | shares 280,457
Granted (in shares) | shares 10,617
Exercised (in shares) | shares (41,644)
Forfeited, cancelled or expired (in shares) | shares (1,926)
Outstanding as of end of period (in shares) | shares 247,504
Exercisable (in shares) | shares 115,544
Weighted- Average Exercise Price Per Share  
Outstanding as of beginning of period (in dollars per share) | $ / shares $ 3.76
Granted (in dollars per share) | $ / shares 6.44
Exercised (in dollars per share) | $ / shares 3.18
Forfeited, cancelled or expired (in dollars per share) | $ / shares 4.48
Outstanding as of end of period (in dollars per share) | $ / shares 3.96
Exercisable (in dollars per share) | $ / shares $ 3.40
Weighted- Average Remaining Contractual Term (Years)  
Outstanding 6 years 4 months 24 days
Exercisable 5 years 3 months 18 days
Aggregate Intrinsic Value  
Outstanding | $ $ 695,499
Exercisable | $ $ 389,015