Commitments and Contingencies - Narrative (Details)		12 Months Ended
	Feb. 06, 2019 USD ($)	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Rent expense		$ 1,200,000	$ 1,200,000
Purchase commitments related to inventory		400,000	200,000
Accrued litigation expense		3,200,000	$ 0
Statutory damages sought per violation of TCPA | Class action Eric B. Fromer Chiropractic Inc.
Operating Leased Assets [Line Items]
Damages sought	$ 500
Treble damages sought per violation of TCPA | Class action Eric B. Fromer Chiropractic Inc.
Operating Leased Assets [Line Items]
Damages sought	$ 1,500
Indemnification Agreement
Operating Leased Assets [Line Items]
Costs to defend lawsuits or settle claims		0
Costs accrued to defend lawsuits		$ 0
Office building, Santa Clara CA
Operating Leased Assets [Line Items]
Non-cancelable operating lease term		7 years
Area of property (sq ft) | ft²		21,848