Employee Benefit Plan (Details)	12 Months Ended
Dec. 31, 2018
Employee Benefit Plan
Percentage of eligible compensation on a pre tax basis	100.00%

Percentage employer matches of the employee's percentage contribution matched.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration