ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SEGMENT INFORMATION (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) segment item	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 item
Segment Information
Number of operating segments \| segment	1
Number of distributors \| item	3	3	3
Accounts receivable related to product sales	$ 102,056	$ 71,125
Accounts receivable balances related to royalties	200	100
Recent Accounting Pronouncements
Accumulated deficit	$ (116,744)	$ (28,024)
Supplier concentration risk \| Gralise
Segment Information
Number of third-party suppliers for the supply of gabapentin \| item	1
Product shipments \| Customer concentration risk \| Distributor one
Segment Information
Percentage of concentration risk	36.00%	36.00%	35.00%
Product shipments \| Customer concentration risk \| Distributor two
Segment Information
Percentage of concentration risk	27.00%	27.00%	27.00%
Product shipments \| Customer concentration risk \| Distributor three
Segment Information
Percentage of concentration risk	25.00%	24.00%	26.00%
Product sales related accounts receivable \| Credit concentration risk \| Distributor one
Segment Information
Percentage of concentration risk	39.00%	38.00%	35.00%
Product sales related accounts receivable \| Credit concentration risk \| Distributor two
Segment Information
Percentage of concentration risk	33.00%	25.00%	32.00%
Product sales related accounts receivable \| Credit concentration risk \| Distributor three
Segment Information
Percentage of concentration risk	20.00%	25.00%	33.00%

Represents the amount of accounts receivable related to royalties.

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- Definition

Represents the number of distributors of the entity.

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No definition available.

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- Definition

Represents the number of third-party suppliers for the supply of gabapentin, the active pharmaceutical ingredient.

+ References

No definition available.

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3-4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Subparagraph a(1)
-Article 5

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 4
-Article 5

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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