Revenue Recognition - Schedule of Product Sales Allowances and Accruals (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]
Provision related to current period sales	$ 900	$ 100
Rayaldee
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	0
Provision related to current period sales	3,413
Credits or payments made	(2,395)
Ending balance	1,018	0
Total gross Rayaldee sales	$ 12,482
Provision for Rayaldee sales allowances and accruals as a percentage of gross Rayaldee sales	27.00%
Chargebacks, discounts, rebates and fees \| Rayaldee
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	$ 0
Provision related to current period sales	1,591
Credits or payments made	(1,358)
Ending balance	233	0
Governmental \| Rayaldee
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	0
Provision related to current period sales	1,332
Credits or payments made	(984)
Ending balance	348	0
Returns \| Rayaldee
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	0
Provision related to current period sales	490
Credits or payments made	(53)
Ending balance	$ 437	$ 0

Allowance For Doubtful Accounts, Provision For Allowance As Percent Of Gross Sales

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- Definition

Allowance For Doubtful Accounts Receivable, Decrease, Credits Or Payments

+ References

No definition available.

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.5)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Publisher FASB
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- Definition

Aggregate revenue during the period from sale of goods in the normal course of business, before deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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