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Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Institution	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Activity under August 2013 contract settlement [Roll Forward]
Deferred Revenue, beginning balance	$ 3,000
Less: Amount amortized as revenue	375	$ 375
Deferred Revenue, ending balance	$ 2,625
Concentration of Credit Risk and Others Risks and Uncertainties [Abstract]
Number of financial institutions holding company's cash | Institution	2
Prepaid Expenses [Abstract]
Prepayment of facility lease for corporate promotional and marketing purposes	$ 4,000
Lease term	10 years
Cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category [Abstract]
Adjusted Cost	$ 9,269	13,290	$ 8,726	$ 18,658
Adjusted Cost	12,402		15,390
Unrealized Gains	4		1
Unrealized Losses	(1)		(7)
Fair Value	12,405		15,384
Adjusted Cost	17,865		18,686
Fair Value	17,868		18,680
Investments Available for Sale	12,405		15,384
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	5,463		3,296
Fair Value	5,463		3,296
Cash and Cash Equivalents	5,463		3,296
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	3,201		5,005
Unrealized Gains	0		0
Unrealized Losses	0		0
Fair Value	3,201		5,005
Investments Available for Sale	3,201		5,005
U.S. Government 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	1,804		1,806
Unrealized Gains	1		0
Unrealized Losses	0		(3)
Fair Value	1,805		1,803
Investments Available for Sale	1,805		1,803
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	7,397		8,579
Unrealized Gains	3		1
Unrealized Losses	(1)		(4)
Fair Value	7,399		8,576
Investments Available for Sale	7,399		8,576
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member]
Changes in fair value of Level 3 liabilities [Roll Forward]
Beginning balance		320
Gain on derivative liability included in net loss		117
Settlements		(333)
Expiration of warrants		(104)
Ending balance		$ 0
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	9,269		8,726
Fair Value	8,599		9,954
Cash and Cash Equivalents	9,269		8,726
Investments Available for Sale	8,599		9,954
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	5,463		3,296
Cash and Cash Equivalents	5,463		3,296
Recurring [Member] | 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	3,806		5,430
Fair Value	8,599		9,954
Cash and Cash Equivalents	3,806		5,430
Investments Available for Sale	8,599		9,954
Recurring [Member] | 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	3,201		5,005
Fair Value	0		0
Cash and Cash Equivalents	3,201		5,005
Investments Available for Sale	0		0
Recurring [Member] | Level 1 [Member] | U.S. Government 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
Fair Value	1,805		1,803
Cash and Cash Equivalents	0		0
Investments Available for Sale	1,805		1,803
Recurring [Member] | 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	605		425
Fair Value	6,794		8,151
Cash and Cash Equivalents	605		425
Investments Available for Sale	$ 6,794		$ 8,151
August 2013 Contract [Member]
Deferred Revenue [Abstract]
Term of contract	4 years
Contract amount	$ 10,000
Non-refundable cash payment received to date	7,500
Outstanding contract receivable	$ 2,500

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