Leases (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) ft²
Lessee, Lease, Description [Line Items]
Area of property (square feet) | ft²	86,500
Remaining lease term (years)	4 years
Renewal term (years)	5 years
Operating lease cost	$ 0.4
Remaining lease term- operating lease, in years	9 years
Cash payments on operating lease	$ 0.3
Discount rate - operating lease	25.49%
Selling, General and Administrative Expenses
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 0.3
Research and Development Expense
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 0.1