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Employee Benefit Plans and Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of RSU and PSU Activity

A summary of RSU and PSU activity under the 2015 Plan for the twelve months ended December 31, 2021, 2020 and 2019 is as follows:

									Nonvested RSU and PSU Activity
(In millions except weighted average grant date fair value)			Shares Available for Grant						Shares						Weighted  Average Grant Date Fair Value						Aggregate Intrinsic Value
Balance at December 31, 2018			3.2						2.7						$	69.19
Additional shares authorized			2.2						—
Granted			(0.7)						0.7						144.37
Vested			—						(1.4)						69.45
Forfeited			0.2						(0.2)						83.45
Balance at December 31, 2019			4.9						1.8						96.63						$	392.0
Granted			(0.5)						0.5						300.36
Vested			—						(1.0)						92.07
Forfeited			0.1						(0.1)						137.44
Balance at December 31, 2020			4.5						1.2						183.51						430.6
Granted			(0.4)						0.4						351.32
Vested			—						(0.7)						137.90
Forfeited			0.1						(0.1)						279.12
Balance at December 31, 2021			4.2						0.8						$	307.86					$	411.3

Schedule of Share-Based Compensation Expenses

The following table summarizes the share-based compensation expense included in our consolidated statements of operations for the periods shown.

			Twelve Months Ended December 31,
(In millions)			2021						2020						2019
Cost of sales			$	8.5					$	14.6					$	9.0
Research and development			41.0						37.8						33.5
Selling, general and administrative			63.9						67.0						60.2
Total share-based compensation expense			$	113.4					$	119.4					$	102.7

Schedule of Valuation Assumptions for Employee Stock Purchase Plan

We estimate the fair value of ESPP purchase rights on the date of grant using the Black-Scholes option pricing model and the assumptions below for the specified reporting periods.

			Twelve Months Ended December 31,
			2021						2020						2019
Risk free interest rate			0.06% - 0.07%						0.13% - 0.95%						1.72% - 2.55%
Dividend yield			—		%				—		%				—		%
Expected volatility of Dexcom common stock			36% - 45%						51% - 63%						40% - 51%
Expected life (in years)			0.5						0.5						1

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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