Income Taxes - Effective income tax rate reconciliation (Details)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
US federal taxes at statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	0.00%	9.00%	4.00%
Foreign rate differential	(15.00%)	106.00%	36.00%
Permanent differences	0.00%	5.00%	1.00%
Stock-based compensation	(1.00%)	5.00%	5.00%
Research and development credits	10.00%	(57.00%)	(56.00%)
Transaction-related expenses	(6.00%)	44.00%	23.00%
Other	0.00%	2.00%	(2.00%)
Effective Income Tax Rate	23.00%	149.00%	46.00%

Effective Income Tax Rate Reconciliation, Permanent Differences

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Effective Income Tax Reconciliation, Transaction-Related Expenses

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

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-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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