Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details)	Oct. 02, 2018	Jun. 30, 2019 USD ($) employee	Jan. 01, 2019 USD ($)
Accounting Policies [Abstract]
Number of employees | employee		21
Conversion ratio for reverse stock split	0.0833
Cash and cash equivalents and marketable securities		$ 19,600,000
Operating lease, right of use asset		0	$ 3,300,000
Operating lease liability		0	11,300,000
Finance lease liability		466,000	600,000
Financing lease, right of use asset		$ 557,000	$ 600,000