Share-based Compensation - Additional Information (Details) shares in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2019
USD ($)
item
shares
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
|
| Share-based compensation Expense | |||
| Number of share-based compensation plan under which awards are currently made | 2 | ||
| Number of share-based compensation plan under which no further awards will be made | 1 | ||
| Shares of common stock available for issuance | shares | 10.6 | ||
| 2011 Plan and 2018 Plan | |||
| Share-based compensation Expense | |||
| Ratio of awards other than stock options counted against the total number of shares available for issuance | 1.8 | ||
| Inventory | |||
| Share-based compensation Expense | |||
| Share based compensation cost capitalized | $ | $ 1.5 | $ 2.7 | $ 0.4 |