Summary of Significant Accounting Policies Narrative (Details)		12 Months Ended
	Jan. 01, 2012	Dec. 31, 2016 USD ($) Segment	Dec. 31, 2015 USD ($)	Sep. 03, 2009 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of operating segments | Segment		1
Federal insurance coverage on operating cash		$ 250,000
Intangible assets		0	$ 4,136,000	$ 6,300,000
Finite-lived intangible assets useful life (years)	12 years
Amortization expense		200,000	600,000
Intangible asset impairment		$ 3,905,000	0
Additional paid-in capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect from adoption of new accounting standard			100,000
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09 | Accumulated deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect from adoption of new accounting standard			(100,000)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09 | Additional paid-in capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect from adoption of new accounting standard			$ 100,000