Leases - Additional Information (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) ft²	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Leases [Line Items]
Lessee, finance lease, lease not yet commenced, description	The Company does not currently have any finance leases or executed leases that have not yet commenced.
Operating lease, rent expense, net	$ 200,000	$ 100,000
Operating lease, weighted-average remaining lease term	7 years 9 months 18 days
Operating lease, weighted-average discount rate	6.50%
Reimbursement of leasehold expenses	$ 800,000
Carrying amount of lease receivables	3,000,000
Unguaranteed residual assets	0
Operating lease income	100,000	200,000
Property and equipment, net	$ 963,000		$ 1,107,000
NeuroStar Advanced Therapy Systems
Leases [Line Items]
Lessor sales-type lease, Term	3 years
Headquarters and Office Equipment, Including Copiers
Leases [Line Items]
Area of lease facility | ft²	42,000
Lessee, operating lease, extended maturity period	2028-02
Additional lease facility area acquired | ft²	10,000
Lessee, operating lease, existence of option to extend	true
Area of lease facility before lease modification | ft²	32,000
Description of option to extend lease facility	The Company has an option to extend the lease for an additional five-year term
Lessee, operating lease, renewal term	5 years
Office Equipment, Including Copiers
Leases [Line Items]
Lessee, operating lease, maturity period	2023-03
Rental Equipment
Leases [Line Items]
Property and equipment, net	$ 400,000		$ 500,000
Rental equipment depreciation expense	$ 30,000	$ 50,000