Leases - Summary of Supplemental Information Related to Operating Lease (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019
Assets And Liabilities Lessee [Abstract]
Operating lease right-of-use asset	$ 627	$ 900
Lease liability (short-term) (presented within Accrued expenses and other current liabilities)	$ 296
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesAndOtherLiabilities
Lease liability (long-term) (presented within Other liabilities)	$ 381
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Total operating lease liability	$ 677	$ 900
Cash paid for amounts included in the measurement of lease liabilities (presented within Operating cash flows)	$ 259