Stock-Based Compensation - Issued Shares of Common Stock (Details) - 401(k) Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued (shares)	225,780	70,379	102,874
Value of employer match in shares	$ 1,289	$ 762	$ 639