Development and Other Agreements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2013	Nov. 30, 2008	Feb. 29, 2012	Jul. 31, 2014	Feb. 01, 2012
Development Agreements [Line Items]
Development grant and other revenue	$ 2.1	$ 2.9	$ 6.9
Research and Development Arrangement, Value of Grant				4.0
Research and Development Arrangement, Grants Received During Period	2.5	0.5
Helmsley Grant [Member] | Research and Development Grant [Member]
Development Agreements [Line Items]
Research and Development Arrangement, Contract to Perform for Others, Compensation Earned	2.5	0.5
Option One [Member]
Development Agreements [Line Items]
Royalty Guarantees, Commitments, Commitment Period				4 years
Option Two [Member]
Development Agreements [Line Items]
Royalty Guarantees, Commitments, Amount				6.0
Option One [Member]
Development Agreements [Line Items]
Royalty Guarantees, Commitments, Amounts, Per Year				2.0
Edwards Lifesciences LLC [Member]
Development Agreements [Line Items]
Commercial sales royalty maximum	6.00%
Money eligible to be received related to regulatory approvals and manufacturing readiness					12.0
Tandem Diabetes Care, Inc. [Member]
Development Agreements [Line Items]
Development grant and other revenue	0.2	0.5
Tandem Diabetes Care, Inc. [Member] | Maximum [Member]
Development Agreements [Line Items]
Third party contribution to off set expenses								1.0
Tandem Diabetes Care, Inc. [Member] | Initial Payment [Member]
Development Agreements [Line Items]
One-time milestone payment, received						1.0
Regulatory Submission Milestone [Member] | Tandem Diabetes Care, Inc. [Member]
Development Agreements [Line Items]
Additional milestone payments							1.0
Regulatory Approval Milestone [Member] [Member] | Tandem Diabetes Care, Inc. [Member]
Development Agreements [Line Items]
Additional milestone payments	$ 1.0