Stock-Based Payments - Stock Options (Details) - USD ($) |
3 Months Ended | |
---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
Unrecognized compensation costs | $ 18,600,000 | |
Period in which compensation costs will be recognized | 3 years 1 month 6 days | |
Granted and outstanding (in shares) | 953,800 | |
Intrinsic value of options exercised | $ 4,800 | $ 700,000 |
Performance-based stock options | ||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
Unrecognized compensation costs | $ 1,000,000 | |
Period in which compensation costs will be recognized | 3 years 6 months | |
Advisor | Performance-based stock options | ||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
Unrecognized compensation costs | $ 300,000 | |
Period in which compensation costs will be recognized | 7 years 6 months | |
Granted and outstanding (in shares) | 75,000 |