Stockholders' Equity and Stock-Based Compensation - Narrative (Details)			1 Months Ended	12 Months Ended
	Nov. 14, 2019 USD ($) shares	Apr. 30, 2018 shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($) vote plan $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)				5,000,000.0	5,000,000
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.0001	$ 0.0001
Preferred stock, shares issued (in shares)				0	0
Number of votes each share of common stock has rights to (vote) | vote				1
Dividends declared or paid | $				$ 0
Preferred stock, shares outstanding (in shares)				0	0
Conversion ratio		1
Aggregate number of common stock issued upon conversion of convertible stock (shares)		24,600,000
Common stock repurchase plan, authorized | $	$ 10,000,000.0
Number of stock-based compensation plans | plan				2
Credit to previously recognized stock-based compensation expense | $				$ (9,730,000)	$ (4,805,000)	$ (369,000)
Intrinsic value of options exercised | $				15,800,000	6,700,000
Proceeds from the exercise of options | $				1,560,000	$ 362,000	$ 336,000
Unrecognized expense | $				$ 49,000,000
2018 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)				2,600,000
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Time-based RSUs granted (in shares)				403,000
Vested, fair value | $				$ 400,000
Awards outstanding (in shares)				459,000	115,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Time-based RSUs granted (in shares)				2,107,000
Vested, fair value | $				$ 3,100,000
Awards outstanding (in shares)				2,407,000	557,000
Restricted Stock Units | Former Stockholders of Nutronics
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Time-based RSUs granted (in shares)	1,000,000
Grant-date fair value | $	$ 15,800,000
Performance Restricted Stock Awards and Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares affected by changes in metrics and estimated achievement (shares)			200,000
Credit to previously recognized stock-based compensation expense | $			$ 2,100,000
Awards outstanding (in shares)				500,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)				1,500,000
Eligible employee contribution limit of earnings				10.00%
Offering period				6 months
Convertible preferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares outstanding (in shares)					0
2001 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future awards (shares)				0
2018 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Term of awards				10 years