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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 segment item	Dec. 31, 2013 item	Dec. 31, 2012 item
Segment Information
Number of operating segments									1us-gaap_NumberOfOperatingSegments
Basic income (loss) per share
Net income (loss)	$ 94,623,000us-gaap_NetIncomeLoss	$ 6,454,000us-gaap_NetIncomeLoss	$ 12,746,000us-gaap_NetIncomeLoss	$ 17,939,000us-gaap_NetIncomeLoss	$ 41,801,000us-gaap_NetIncomeLoss	$ 6,514,000us-gaap_NetIncomeLoss	$ 478,000us-gaap_NetIncomeLoss	$ (5,480,000)us-gaap_NetIncomeLoss	$ 131,762,000us-gaap_NetIncomeLoss	$ 43,313,000us-gaap_NetIncomeLoss	$ (29,781,000)us-gaap_NetIncomeLoss
Denominator for basic income (loss) per share (in shares)									58,292,633	56,736,009	55,892,563
Basic net income (loss) per share (in dollars per share)	$ 1.61us-gaap_EarningsPerShareBasic	$ 0.11us-gaap_EarningsPerShareBasic	$ 0.22us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.73us-gaap_EarningsPerShareBasic	$ 0.11us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic	$ (0.10)us-gaap_EarningsPerShareBasic	$ 2.26us-gaap_EarningsPerShareBasic	$ 0.76us-gaap_EarningsPerShareBasic	$ (0.53)us-gaap_EarningsPerShareBasic
Total number of antidilutive outstanding common stock options excluded from the diluted net income per common share computation (in shares)									1,578,000	4,824,000	6,000,000
Numerator:
Net income (loss)	94,623,000us-gaap_NetIncomeLoss	6,454,000us-gaap_NetIncomeLoss	12,746,000us-gaap_NetIncomeLoss	17,939,000us-gaap_NetIncomeLoss	41,801,000us-gaap_NetIncomeLoss	6,514,000us-gaap_NetIncomeLoss	478,000us-gaap_NetIncomeLoss	(5,480,000)us-gaap_NetIncomeLoss	131,762,000us-gaap_NetIncomeLoss	43,313,000us-gaap_NetIncomeLoss	(29,781,000)us-gaap_NetIncomeLoss
Add interest expense on convertible debt, net of tax									4,256,000
Net income (loss), diluted									136,018,000	43,313,000	(29,781,000)
Denominator:
Denominator for basic income (loss) per share (in shares)									58,292,633	56,736,009	55,892,563
Add effect of dilutive securities:
Stock options and equivalents									2,463,000	808,000
Convertible debt									5,551,000
Denominator for diluted net income (loss) per share: (in shares)									66,307,364	57,543,979	55,892,563
Diluted net income (loss) per share (in dollars per share)	$ 1.23us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted	$ (0.10)us-gaap_EarningsPerShareDiluted	$ 2.05us-gaap_EarningsPerShareDiluted	$ 0.75us-gaap_EarningsPerShareDiluted	$ (0.53)us-gaap_EarningsPerShareDiluted
Total number of antidilutive outstanding common stock options excluded from the diluted net income per common share computation (in shares)									1,578,000	4,824,000	6,000,000
Number of distributors									3depo_NumberOfDistributors	3depo_NumberOfDistributors	3depo_NumberOfDistributors
Accounts receivable related to product sales	27,008,000us-gaap_AccountsReceivableNetCurrent				11,451,000us-gaap_AccountsReceivableNetCurrent				27,008,000us-gaap_AccountsReceivableNetCurrent	11,451,000us-gaap_AccountsReceivableNetCurrent	3,600,000us-gaap_AccountsReceivableNetCurrent
Accounts receivable balances related to royalties	500,000				7,200,000				500,000	7,200,000
Salix Pharmaceuticals, Inc. (formerly Santarus Inc.)
Add effect of dilutive securities:
Accounts receivable balances related to royalties					$ 6,400,000					$ 6,400,000
Supplier concentration risk \| Gralise
Add effect of dilutive securities:
Number of third-party suppliers for the supply of gabapentin									1
Stock options and equivalents
Basic income (loss) per share
Total number of antidilutive outstanding common stock options excluded from the diluted net income per common share computation (in shares)									1,578,000	4,824,000	6,000,000
Add effect of dilutive securities:
Total number of antidilutive outstanding common stock options excluded from the diluted net income per common share computation (in shares)									1,578,000	4,824,000	6,000,000
Product shipments \| Customer concentration risk \| Distributor one
Add effect of dilutive securities:
Percentage of concentration risk									26.00%	35.00%	39.00%
Product shipments \| Customer concentration risk \| Distributor two
Add effect of dilutive securities:
Percentage of concentration risk									27.00%	37.00%	40.00%
Product shipments \| Customer concentration risk \| Distributor three
Add effect of dilutive securities:
Percentage of concentration risk									35.00%	21.00%	14.00%
Product sales related accounts receivable \| Credit concentration risk \| Distributor one
Add effect of dilutive securities:
Percentage of concentration risk									33.00%	23.00%	46.00%
Product sales related accounts receivable \| Credit concentration risk \| Distributor two
Add effect of dilutive securities:
Percentage of concentration risk									32.00%	35.00%	42.00%
Product sales related accounts receivable \| Credit concentration risk \| Distributor three
Add effect of dilutive securities:
Percentage of concentration risk									35.00%	34.00%	5.00%