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Summary of significant accounting policies (Details 2) $ in Thousands		1 Months Ended	12 Months Ended
	Aug. 04, 2014 state	Aug. 31, 2014	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Research and development costs
Minimum age of Ambulatory Patient	5 years	5 years
Number of States | state	31
Deferred research and development advance payments			$ 600	$ 900
Impairment of long-lived assets
Impairment of long-lived assets			0
Income Tax Expense (Benefit), Continuing Operations
Income tax (expense) benefit			(485)	4,693
Recent accounting pronouncements
Unamortized debt issuance cost			$ 2,800
New Jersey
Income Tax Expense (Benefit), Continuing Operations
Income tax (expense) benefit				$ 4,900

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- Definition

Represents the carrying amount of deferred research and development costs.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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-Section 45
-Paragraph 28
-Subparagraph (b)
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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-Name Accounting Standards Codification
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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-Name Accounting Standards Codification
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-Section S99
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