Vitaros Licensing and Distribution Agreements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue	$ 2,629	$ 1,273	$ 462	$ 475	$ 1,907	$ 1,898	$ 5,454	$ 0	$ 4,839	$ 9,259	$ 2,511
Regulatory Milestones	5,331								5,331
Commercial Launch Milestones	27,593								27,593
Sales Milestones	174,655								174,655
Total	207,579								207,579
Commercialization Partner
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue											1,587
Ferring
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue									2,250	0	0
Regulatory Milestones	2,000								2,000
Commercial Launch Milestones	0								0
Sales Milestones	14,000								14,000
Total	16,000								16,000
Sandoz
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue									1,736	2,514	272
Regulatory Milestones	319								319
Commercial Launch Milestones	1,500								1,500
Sales Milestones	45,613								45,613
Total	47,432								47,432
Takeda Pharmaceuticals International GmbH (“Takeda”)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue									398	141	0
Regulatory Milestones	437								437
Commercial Launch Milestones	0								0
Sales Milestones	36,600								36,600
Total	37,037								37,037
Majorelle
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue									245	4,150	0
Regulatory Milestones	2,000								2,000
Commercial Launch Milestones	0								0
Sales Milestones	16,934								16,934
Total	18,934								18,934
Recordati
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue									194	2,454	0
Regulatory Milestones	0								0
Commercial Launch Milestones	1,093								1,093
Sales Milestones	37,692								37,692
Total	38,785								38,785
Bracco SpA (“Bracco”)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue									16	$ 0	669
Regulatory Milestones	0								0
Commercial Launch Milestones	0								0
Sales Milestones	4,916								4,916
Total	4,916								4,916
Warner Chilcott, now a subsidiary of Allergan, Inc. (Allergan)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue											$ 646
Regulatory Milestones	0								0
Commercial Launch Milestones	25,000								25,000
Sales Milestones	0								0
Total	25,000								25,000
Abbott Laboratories Limited, now a subsidiary of Mylan N.V. (“Mylan”)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Regulatory Milestones	225								225
Commercial Launch Milestones	0								0
Sales Milestones	13,000								13,000
Total	13,225								13,225
Neopharm Scientific Limited (“Neopharm”)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Regulatory Milestones	250								250
Commercial Launch Milestones	0								0
Sales Milestones	4,000								4,000
Total	4,250								4,250
Elis Pharmaceuticals Limited (“Elis”)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Regulatory Milestones	100								100
Commercial Launch Milestones	0								0
Sales Milestones	1,900								1,900
Total	$ 2,000								$ 2,000