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Retirement Plan (Notes)	12 Months Ended
Retirement Plan (Notes)	Dec. 31, 2019
Retirement Benefits [Abstract]
Compensation and Employee Benefit Plans [Text Block]	The Company has a 401(k) plan for its U.S. employees. The plan allows employees to contribute a percentage of their pretax earnings annually, subject to limitations imposed by the Internal Revenue Service. The plan also allows the Company to make a matching contribution, subject to certain limitations. To date, the Company has made no contributions to the 401(k) plan.