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Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Patent Institution	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) $ / shares	Dec. 31, 2013 USD ($)
Revenue Recognition [Abstract]
Number of patents license agreements | Patent			6
Deferred Revenue [Abstract]
Term of contract			5 years
Contract amount			$ 10,000
Annual payment on contract, received			7,500
Activity under August 2013 contract settlement [Roll Forward]
Deferred Revenue, Beginning Balance			2,000
Payment received			2,500
Less: Amount amortized as revenue	$ (375)	$ (292)	(1,125)	$ (792)
Deferred Revenue, Ending Balance	3,375		3,375		$ 2,000
Royalties Expense [Abstract]
Royalties expense as a result of royalty agreement with Leidos	1,029	0	$ 5,264	0
Concentration of Credit Risk and Others Risks and Uncertainties [Abstract]
Number of financial institutions holding company's cash | Institution			2
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost	9,990	8,498	$ 9,990	8,498	18,658	$ 19,173
Adjusted Cost	15,382		15,382		40,048
Unrealized Gains	4		4		3
Unrealized Losses	0		0		(5)
Fair Value	15,386		15,386		40,046
Adjusted Cost	20,787		20,787		41,231
Fair Value	20,791		20,791		41,229
Investments Available for Sale	15,386		15,386		40,046
Fair value of liabilities [Abstract]
Series 1 Warrants					320
Cash [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost	5,405		5,405		1,183
Fair Value	5,405		5,405		1,183
Cash and Cash Equivalents	5,405		5,405		1,183
Mutual Funds [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost	4,585		4,585		10,139
Unrealized Gains	0		0		0
Unrealized Losses	0		0		0
Fair Value	4,585		4,585		10,139
Investments Available for Sale	4,585		4,585		10,139
Corporate securities [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost	353		353		9,405
Unrealized Gains	0		0		1
Unrealized Losses	0		0		(3)
Fair Value	353		353		9,403
Investments Available for Sale	353		353		9,403
U.S agency securities [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost	10,444		10,444		20,504
Unrealized Gains	4		4		2
Unrealized Losses	0		0		(2)
Fair Value	10,448		10,448		20,504
Investments Available for Sale	10,448		10,448		$ 20,504
Series I Warrants [Member]
Fair value assumptions [Abstract]
Warrant exercise price (in dollars per share) | $ / shares					$ 3.59
Common share price (in dollars per share) | $ / shares					$ 5.49
Discount rate					1.65%
Expected volatility rate					89.60%
Fair value of liabilities [Abstract]
Series 1 Warrants					$ 320
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of liabilities [Abstract]
Series 1 Warrants					0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Series I Warrants [Member]
Fair value of liabilities [Abstract]
Series 1 Warrants					0
Significant Other Observable Inputs (Level 2) [Member]
Fair value of liabilities [Abstract]
Series 1 Warrants					0
Significant Other Observable Inputs (Level 2) [Member] | Series I Warrants [Member]
Fair value of liabilities [Abstract]
Series 1 Warrants					0
Significant Unobservable Inputs (Level 3) [Member]
Fair value of liabilities [Abstract]
Series 1 Warrants					320
Changes in fair value of Level 3 liabilities [Roll Forward]
Beginning Balance			320	2,564	2,564
(Gain) Loss on derivative liability included in net loss			117	(2,126)
Settlements			(333)	(7)
Expiration of warrants			(104)	0
Ending Balance	0	$ 431	0	$ 431	320
Significant Unobservable Inputs (Level 3) [Member] | Series I Warrants [Member]
Fair value of liabilities [Abstract]
Series 1 Warrants					320
Recurring [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value	9,990		9,990		18,658
Fair Value	10,801		10,801		22,571
Cash and Cash Equivalents	9,990		9,990		18,658
Investments Available for Sale	10,801		10,801		22,571
Recurring [Member] | Cash [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value	5,405		5,405		1,183
Cash and Cash Equivalents	5,405		5,405		1,183
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value	4,585		4,585		17,475
Fair Value	10,801		10,801		22,571
Cash and Cash Equivalents	4,585		4,585		17,475
Investments Available for Sale	10,801		10,801		22,571
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual Funds [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value	4,585		4,585		10,139
Fair Value	0		0		0
Cash and Cash Equivalents	4,585		4,585		10,139
Investments Available for Sale	0		0		0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate securities [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value	0		0		1,645
Fair Value	353		353		7,758
Cash and Cash Equivalents	0		0		1,645
Investments Available for Sale	353		353		7,758
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S agency securities [Member]
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Fair Value	0		0		5,691
Fair Value	10,448		10,448		14,813
Cash and Cash Equivalents	0		0		5,691
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