Commitments and Contingencies (Narrative) (Details) - USD ($)		12 Months Ended
	Jan. 01, 2012	Dec. 31, 2019	Dec. 31, 2018	Oct. 31, 2011
Operating lease term	10 years
Operating lease base rent	$ 1,300,000
Annual increase in rent percentage	3.00%
Base rent at the end of lease term	$ 1,600,000
Period of lease and rental abatement credit	7 months
Lease and rental abatement credit	$ 1,500,000
Operating lease remaining lease term		2 years
Operating lease discount rate		15.00%
Rent expenses operating lease			$ 1,400,000
Rent expense under operating leases		$ 1,500,000
Cash payments for operating leases		$ 1,700,000
Letter of Credit [Member]
Short-term Debt				$ 1,000,000
Short term borrowings reduction amount each subsequent year				100,000
Minimal amount of short term borrowing, end of lease				$ 500,000