Commitments	3 Months Ended
Mar. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Commitments	10. Commitments Licensing and Purchasing Agreements As of March 31, 2016, the Company has obligations under certain consultancy arrangements to pay up to approximately $23.4 million in the aggregate in the event that specified revenue-based milestones are achieved prior to 2024. Any such payment will be made in a combination of cash and the Company’s common shares as provided in the agreements. Any payments in satisfaction of theses contingent obligations are considered a cost of goods sold and are recognized as and if milestones are achieved. These agreements expire on various dates through 2024. Executive Severance Plans The Company has employment contracts with key executives and maintains severance plans that provide for the payment of severance and other benefits if terminated for reasons other than cause, as defined in those agreements and plans. Certain agreements call for payments that are based on historical compensation, accordingly, the amount of the contractual commitment will change over time commensurate with the executive’s applicable earnings. At March 31, 2016, future commitments for such key executives were approximately $22.3 million. In certain circumstances, the agreements call for the acceleration of equity vesting. Those figures are not reflected in the above information. Leasing Commitments Assumed in Business Combinations In connection with the acquisition of Ellipse Technologies (see Note 5 to the Unaudited Consolidated Financial Statements for further information regarding the acquisition) the Company assumed the operating leases to its office facilities. The leases were determined to be of similar terms that would be expected to be provided to the Company had it entered into the leasing agreements independently. In connection with the operating leases, the Company acquired the security deposits recorded and maintained as restricted cash which total $1.5 million as of March 31, 2016. The Company’s future lease payment commitments total $7.5 million through the terms of the lease. The terms of the leases extend through 2020, and generally provide for periodic rent increases. Rent expense is recognized on a straight-line basis over the term of the lease. Accordingly, rent expense recognized in excess of rent paid is reflected as a liability in the accompanying Unaudited Consolidated Balance Sheets.

10. Commitments

Licensing and Purchasing Agreements

As of March 31, 2016, the Company has obligations under certain consultancy arrangements to pay up to approximately $23.4 million in the aggregate in the event that specified revenue-based milestones are achieved prior to 2024. Any such payment will be made in a combination of cash and the Company’s common shares as provided in the agreements. Any payments in satisfaction of theses contingent obligations are considered a cost of goods sold and are recognized as and if milestones are achieved. These agreements expire on various dates through 2024.

Executive Severance Plans

The Company has employment contracts with key executives and maintains severance plans that provide for the payment of severance and other benefits if terminated for reasons other than cause, as defined in those agreements and plans. Certain agreements call for payments that are based on historical compensation, accordingly, the amount of the contractual commitment will change over time commensurate with the executive’s applicable earnings. At March 31, 2016, future commitments for such key executives were approximately $22.3 million. In certain circumstances, the agreements call for the acceleration of equity vesting. Those figures are not reflected in the above information.

Leasing Commitments Assumed in Business Combinations

In connection with the acquisition of Ellipse Technologies (see Note 5 to the Unaudited Consolidated Financial Statements for further information regarding the acquisition) the Company assumed the operating leases to its office facilities. The leases were determined to be of similar terms that would be expected to be provided to the Company had it entered into the leasing agreements independently. In connection with the operating leases, the Company acquired the security deposits recorded and maintained as restricted cash which total $1.5 million as of March 31, 2016. The Company’s future lease payment commitments total $7.5 million through the terms of the lease.

The terms of the leases extend through 2020, and generally provide for periodic rent increases. Rent expense is recognized on a straight-line basis over the term of the lease. Accordingly, rent expense recognized in excess of rent paid is reflected as a liability in the accompanying Unaudited Consolidated Balance Sheets.