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Acquisitions - Shooter Detection Systems - Consideration Paid and Fair Value of Assets Acquired (Details) - USD ($) $ in Thousands | Dec. 14, 2020 | Jun. 30, 2021 | Dec. 31, 2020
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Tangible and Intangible Net Assets: |  |  |
Goodwill |  | $ 112,901 | $ 112,838
Shooter Detection Systems |  |  |
Calculation of Purchase Consideration: |  |  |
Cash paid, net of working capital adjustment | $ 26,577 |  |
Total consideration | 26,577 |  |
Tangible and Intangible Net Assets: |  |  |
Cash | 311 |  |
Accounts receivable | 1,179 |  |
Inventory | 917 |  |
Other current assets | 240 |  |
Property and equipment | 77 |  |
Operating lease right-of-use assets | 384 |  |
Other assets | 348 |  |
Accounts payable | (19) |  |
Accrued expenses | (111) |  |
Operating lease current liabilities | (51) |  |
Operating lease liabilities | (333) |  |
Goodwill | 7,239 |  |
Total tangible and intangible net assets | 26,577 |  |
Customer Relationships | Shooter Detection Systems |  |  |
Tangible and Intangible Net Assets: |  |  |
Intangible assets acquired | 2,362 |  |
Developed Technology | Shooter Detection Systems |  |  |
Tangible and Intangible Net Assets: |  |  |
Intangible assets acquired | 13,522 |  |
Trade Name | Shooter Detection Systems |  |  |
Tangible and Intangible Net Assets: |  |  |
Intangible assets acquired | $ 512 |  |

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