Commitments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Lessee, Operating Lease, Description [Abstract]
Right-of-use assets	$ 1,392	$ 1,392		$ 0
Lease liabilities	1,413	1,413
Amortization of right-of-use asset		240	$ 0
Operating lease costs	108	335
Cash paid for amounts included in measurement of operating lease liabilities	$ 110	$ 314
Incremental borrowing rate		9.76%
Weighted average remaining lease term	4 years 4 months 24 days	4 years 4 months 24 days
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remaining in 2019	$ 57	$ 57
2020	436	436
2021	456	456
2022	371	371
2023	242	242
Thereafter	186	186
Total remaining lease payments	1,748	1,748
Less: imputed interest	(335)	(335)
Total lease liabilities	$ 1,413	$ 1,413
Minimum [Member]
Lessee, Operating Lease, Description [Abstract]
Remaining lease term		1 year
Maximum [Member]
Lessee, Operating Lease, Description [Abstract]
Remaining lease term		5 years
ASU 2016-02 [Member]
Lessee, Operating Lease, Description [Abstract]
Right-of-use assets				848
Lease liabilities				848
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Total lease liabilities				$ 848
Facility One [Member]
Lessee, Operating Lease, Description [Abstract]
Renewal term	2 years	2 years
Carlsbad Facility [Member]
Lessee, Operating Lease, Description [Abstract]
Renewal term	5 years	5 years
Carlsbad Facility [Member] | ASU 2016-02 [Member]
Lessee, Operating Lease, Description [Abstract]
Right-of-use assets	$ 784	$ 784
Lease liabilities	784	784
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Total lease liabilities	$ 784	$ 784