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Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost		$ 3,440
Gross unrealized gains		4,954
Gross unrealized losses		0
Estimated fair value		8,394
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 97,891	2,179
Gross unrealized gains	4,944	4,954
Gross unrealized losses	(44)	0
Estimated fair value	102,791	7,133
Bank Deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	43,043
Gross unrealized gains	0
Gross unrealized losses	(4)
Estimated fair value	43,039
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	41,238
Gross unrealized gains	0
Gross unrealized losses	(35)
Estimated fair value	41,203
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Cost	1,747
Gross unrealized gains	0
Gross unrealized losses	0
Estimated fair value	1,747
Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Cost	10,020
Gross unrealized gains	0
Gross unrealized losses	(5)
Estimated fair value	10,015
Corporate Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Cost	1,843
Gross unrealized gains	4,944
Gross unrealized losses	0
Estimated fair value	$ 6,787
Certificates of Deposit - Restricted
Schedule of Available-for-sale Securities [Line Items]
Cost		1,261
Gross unrealized gains		0
Gross unrealized losses		0
Estimated fair value		$ 1,261

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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