Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company engages Dr. Mark Kroll, a member of the Board of Directors, to provide consulting services. The expenses related to these services were approximately $44,000 and $50,000 for the three months ended September 30, 2015 and 2014, respectively, and $156,000 and $121,000 for the nine months ended September 30, 2015 and 2014, respectively. At September 30, 2015 and December 31, 2014, the Company had accrued liabilities of approximately $19,000 and $8,000, respectively, related to these services. The Company subscribes to a mobile collaboration software suite co-founded and managed by Bret Taylor, a member of the Board of Directors. The Company licenses the software for approximately $20,000 per quarter, and as of September 30, 2015 had prepaid costs related to an annual subscription of approximately $57,000. No such deferred costs were recorded at December 31, 2014. In connection with the acquisition of Tactical Safety Responses Limited (Note 14), the Company assumed two long-term non-cancellable operating leases for business premises with the former owners who are now employees of the Company. The leases have an average remaining contractual term 15 years and require aggregate annual rental payments of approximately $45,000. Prepaid rental payments as of September 30, 2015 were negligible.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.