Commitments And Contingencies (Narrative) (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2017 USD ($) ft² $ / ft²	Jun. 30, 2017 USD ($) ft² shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) ft² shares	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Commitments and Contingencies [Line Items]
Warrants outstanding | shares		705,121		705,121
Lease expiration date				Jun. 30, 2017
Operating lease, monthly expense				$ 21,000
Area Of Lease | ft²	15,700	4,300		4,300
Lease term	62 months
Security deposit		$ 101,000		$ 101,000
Lease renewable term	5 years
Lease obligations, less than one year						$ 300,000
Lease obligations, one to three years						1,100,000
Lease obligations,three to five years						1,100,000
Lease obligations, more than five years						$ 300,000
Rent expense, including common area maintenance charges		74,000	$ 49,000	$ 137,000	$ 99,000
Maximum [Member]
Commitments and Contingencies [Line Items]
Written notice period for right to extend lease term				12 months
Minimum [Member]
Commitments and Contingencies [Line Items]
Written notice period for right to extend lease term				9 months
Tier One Rent Expense First Two Months Of Lease Term [Member]
Commitments and Contingencies [Line Items]
Operating lease, monthly expense	$ 42,400
Tier Two Rent Expense [Member]
Commitments and Contingencies [Line Items]
Operating lease, monthly expense	$ 50,300
Landlord [Member]
Commitments and Contingencies [Line Items]
Landlord obligatory improvement allowance per rentable square foot | $ / ft²	135.00
Initial tenant leashold improvements		$ 2,100,000		$ 2,100,000