Summary of Significant Accounting Policies Recent Accounting Pronouncements (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	$ 820,000	$ 838,000
Other assets	281,000	358,000
Current portion of notes payable	1,269,000	4,449,000
Notes payable, net of current portion	39,504,000	26,121,000
ASU 2015-03 | Scenario, Adjustment
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	(22,000)
Current portion of notes payable	$ (22,000)
New Accounting Pronouncement, Early Adoption, Effect | ASU 2015-03
New Accounting Pronouncements or Change in Accounting Principle
Other assets		(102,000)
Notes payable, net of current portion		$ (102,000)