Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Institution	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Patent License Agreements [Abstract]
Minimum period after delivery in which fees are generally presumed not to be fixed or determinable, and revenue is deferred and recognized as earned			12 months
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		$ 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	8,527	$ 9,990	$ 8,527	$ 9,990	$ 8,726	$ 18,658
Adjusted Cost	12,428		12,428		15,390
Unrealized Gains	7		7		1
Unrealized Losses	0		0		(7)
Fair Value	12,435		12,435		15,384
Adjusted Cost	17,763		17,763		18,686
Fair Value	17,770		17,770		18,680
Investments Available for Sale	12,435		12,435		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	5,335		5,335		3,296
Fair Value	5,335		5,335		3,296
Cash and Cash Equivalents	5,335		5,335		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	3,192		3,192		5,005
Unrealized Gains	0		0		0
Unrealized Losses	0		0		0
Fair Value	3,192		3,192		5,005
Investments Available for Sale	3,192		3,192		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	1,803		1,803		1,806
Unrealized Gains	2		2		0
Unrealized Losses	0		0		(3)
Fair Value	1,805		1,805		1,803
Investments Available for Sale	1,805		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	7,433		7,433		8,579
Unrealized Gains	5		5		1
Unrealized Losses	0		0		(4)
Fair Value	7,438		7,438		8,576
Investments Available for Sale	7,438		7,438		8,576
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	8,527		8,527		8,726
Fair Value	9,243		9,243		9,954
Cash and Cash Equivalents	8,527		8,527		8,726
Investments Available for Sale	9,243		9,243		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	5,335		5,335		3,296
Cash and Cash Equivalents	5,335		5,335		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	3,192		3,192		5,430
Fair Value	9,243		9,243		9,954
Cash and Cash Equivalents	3,192		3,192		5,430
Investments Available for Sale	9,243		9,243		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	3,192		3,192		5,005
Fair Value	0		0		0
Cash and Cash Equivalents	3,192		3,192		5,005
Investments Available for Sale	0		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		0
Fair Value	1,805		1,805		1,803
Cash and Cash Equivalents	0		0		0
Investments Available for Sale	1,805		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	0		0		425
Fair Value	7,438		7,438		8,151
Cash and Cash Equivalents	0		0		425
Investments Available for Sale	7,438		$ 7,438		$ 8,151
August 2013 Contract [Member]
Deferred Revenue [Abstract]
Term of contract			4 years
Contract amount			$ 10,000
Activity under August 2013 contract settlement [Roll Forward]
Deferred Revenue, beginning balance			3,000
Payment received			2,500
Less: Amount amortized as revenue	(375)	$ (375)	(1,125)	$ (1,125)
Deferred Revenue, ending balance	$ 4,375		$ 4,375