Leases - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) ft²	Mar. 31, 2018 USD ($)	Dec. 31, 2018 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	$ 100,000
Operating lease, weighted-average remaining lease term	9 years
Operating lease, weighted-average discount rate	6.50%
Carrying amount of lease receivables	$ 400,000
Unguaranteed residual assets	0
Operating lease income	200,000	$ 300,000
Property and equipment, net	$ 1,210,000		$ 1,378,000
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	32,000
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
Combined area of lease facility | ft²	42,000
Description of option to extend lease facility	The Company has an option to extend the lease on its combined 42,000 square foot facility 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	$ 800,000		$ 900,000
Rental equipment depreciation expense	$ 50,000	$ 60,000