Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) Business_Segment	Dec. 31, 2016 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jul. 31, 2010 USD ($)
Market Concentrations and Credit Risk [Line Items]
Number of business segments		1	1
FDIC insured amount							$ 250,000
Cash and cash equivalents uninsured amount	$ 33,200,000	$ 33,200,000	$ 33,200,000	$ 33,200,000	$ 27,700,000
Goodwill impairment					0
impairment of indefinite useful lives intangible				0	0
Impairment of intangible assets with finite lives				0	0
Patents
Market Concentrations and Credit Risk [Line Items]
Intangible assets, net of accumulated amortization				$ 842,000	$ 851,000	$ 594,000
Minimum
Market Concentrations and Credit Risk [Line Items]
Property and equipment estimated useful life	3 years
Maximum
Market Concentrations and Credit Risk [Line Items]
Property and equipment estimated useful life	7 years