Commitments and Contingencies (Details) numberOfClaims in Thousands, $ in Thousands							1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended	24 Months Ended
	Aug. 14, 2020 USD ($)	Mar. 20, 2020 USD ($)	Oct. 16, 2019 numberOfClaims	Apr. 25, 2019 lawsuit	Jun. 14, 2018 defendant	Dec. 08, 2017 defendant	May 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Oct. 03, 2020 USD ($)	Sep. 28, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 lawsuit	Dec. 31, 2019 USD ($)	Aug. 18, 2019
Loss Contingencies [Line Items]
Number of defendants dismissed | defendant					1
Number of lawsuits | lawsuit														7
Number of lawsuits consolidated | lawsuit				2										3
Bad debt expense											$ 461	$ 29
Release of product return and rebate reserves													$ 12,400
Letter of Credit
Loss Contingencies [Line Items]
Outstanding letters of credit											24,800				$ 24,600
Purchase Commitment
Loss Contingencies [Line Items]
Remaining minimum amount committed											430,500
Purchase Commitment | Accrued liabilities
Loss Contingencies [Line Items]
Remaining minimum amount committed											7,900
Purchase Commitment to Third Party Hosting Provider
Loss Contingencies [Line Items]
Remaining minimum amount committed											156,900
Purchase Commitment Accrual
Loss Contingencies [Line Items]
Remaining minimum amount committed											$ 17,300
Aliphcom, Inc. dba Jawbone
Loss Contingencies [Line Items]
Number of defendants | defendant					6	6
Sleep Tracking
Loss Contingencies [Line Items]
Reduction in challenged fees, percent																90.00%
Number of new claims filed | numberOfClaims			80
Number of claims settled | numberOfClaims			141
Sleep Tracking | Attorneys' Fees Awarded
Loss Contingencies [Line Items]
Damages awarded, value		$ 6,900
Settlement amount award to other party	$ 5,600
Sleep Tracking | Litigation Costs
Loss Contingencies [Line Items]
Damages awarded, value		$ 200
PurePulse Class Action Lawsuit
Loss Contingencies [Line Items]
Settlement amount award to other party							$ 33,300
Wynit Distribution | Customer Concentration Risk
Loss Contingencies [Line Items]
Unrecognized revenue, net										$ 8,100
Accounts receivable charge recorded										35,800
Unrecoverable inventory										5,500
Accounts receivable for shipments made in the quarter										30,300
Probable insurance proceeds										26,800
Insurance proceeds receivable, accounts receivable										22,700
Insurance proceeds receivable, inventory										4,100
Charges offset by insurance recorded										9,000
Bad debt expense										7,600
Cost of revenue										$ 1,400
Proceeds from insurance settlement								$ 5,400	$ 21,400