Basis and Summary of Significant Accounting Policies - Supplemental Disclosure of Noncash Investing Transactions (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
| Accounting Policies [Abstract] | |||
| Asset acquisition, fair value of non-cash consideration | $ 0.6 | ||
| Asset acquisition, non-cash settlement of accounts receivable | $ 0.9 | $ 0.4 | |