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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2016

Summary of Significant Accounting Policies [Abstract]

Schedule of Deferred Revenue

Activity under the August 2013 Contract Settlement was as follows:

Deferred Revenue, December 31, 2015		$	3,000
Less: Amount amortized as revenue			375
Deferred Revenue, March 31, 2016		$	2,625

Cash and Available-for-Sale Securities Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value by Significant Investment Category

The following tables show the adjusted cost, gross unrealized gains, gross unrealized losses and fair value of our securities by significant investment category as of March 31, 2016 and December 31, 2015.

		March 31, 2016
		Adjusted  Cost				Unrealized  Gains				Unrealized  Losses				Fair Value				Cash and Cash  Equivalents				Investments  Available for  Sale
Cash		$	5,463			$	—			$	—			$	5,463			$	5,463			$	—
Level 1:
Mutual funds			3,201				—				—				3,201				3,201				—
U.S. government securities			1,804				1				—				1,805				—				1,805
U.S. agency securities			7,397				3				(1	)			7,399				605				6,794
			12,402				4				(1	)			12,405				3,806				8,599
Total		$	17,865			$	4			$	(1	)		$	17,868			$	9,269			$	8,599

		December 31, 2015
		Adjusted Cost				Unrealized Gains				Unrealized Losses				Fair Value				Cash and Cash Equivalents				Investments Available for Sale
Cash		$	3,296			$	—			$	—			$	3,296			$	3,296			$	—
Level 1:
Mutual funds			5,005				—				—				5,005				5,005				—
U.S. government securities			1,806				—				(3	)			1,803				—				1,803
U.S. agency securities			8,579				1				(4	)			8,576				425				8,151
			15,390				1				(7	)			15,384				5,430				9,954
Total		$	18,686			$	1			$	(7	)		$	18,680			$	8,726			$	9,954

Summary of Changes in Fair Value of Level 3 Liabilities

The following table sets forth a summary of changes in the fair value of our Level 3 liability stated at fair value for the three months ended March 31, 2015.

		Three Months Ended March 31, 2015 Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Balance December 31, 2014		$	320
Gain on derivative liability included in net loss			117
Settlements			(333	)
Expiration of warrants			(104	)
Balance March 31, 2015		$	—

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Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
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-Subparagraph (SAB TOPIC 13.A.4(a).Q1)
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Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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