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Stockholders' Equity - Nonqualified Cash Plan and Equity Incentive Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Stockholders' Equity
Deferred compensation investment	$ 4.4	$ 2.7
2007 Plan and 2007 Director Plan
Stockholders' Equity
Award term	P10Y
Vesting percentage	100.00%
2007 Plan and 2007 Director Plan | First Anniversary
Stockholders' Equity
Vesting percentage	25.00%
Maximum | 2007 Plan and 2007 Director Plan | Options to purchase common stock
Stockholders' Equity
Number of shares reserved for issuance	10,667,216

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