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Business Combinations - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2019 | Jan. 25, 2019 | Jan. 02, 2019 | Nov. 01, 2018 | May 09, 2018 | Feb. 14, 2018 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 10,441,000 |  | $ 9,286,000
3VR |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Date of acquisition completed |  |  |  |  |  | Feb. 14, 2018 |  | Feb. 14, 2018 |  |
Business combination, aggregate consideration |  |  |  |  |  | $ 6,200,000 |  |  |  |
Business combination, payment of cash |  |  |  |  |  | 1,600,000 |  |  |  |
Business combination, issuance of notes |  |  |  |  |  | $ 2,000,000 |  |  |  |
Business combination, issuance of common stock, shares |  |  |  |  |  | 609,830 |  |  |  |
Business combination, issuance of common stock |  |  |  |  |  | $ 2,300,000 |  |  |  |
Business combination, issuance of common stock value held back |  | $ 300,000 |  |  |  |  |  |  |  |
Business combination, issuance of common stock shares held back |  | 93,406 |  |  |  | 294,927 |  |  |  |
Reduction in purchase consideration |  |  |  |  | $ 660,000 |  |  |  |  |
Reduction in goodwill |  |  |  |  | $ 660,000 |  |  |  |  |
Business combination, cancellation of common stock shares held back |  |  |  |  | 181,319 |  |  |  |  |
Product shipments have to be achieved to obligate earn-out consideration |  |  |  |  |  | $ 24,100,000 |  |  |  |
Amount of earn-out consideration of payable in shares of common stock |  |  |  |  |  | 3,500,000 |  |  |  |
Potential maximum earn-out value |  |  |  |  |  | 7,000,000 |  |  |  |
Amount of shipments should exceed to obligate potential maximum earn-out value |  |  |  |  |  | 48,200,000 |  |  |  |
Goodwill |  |  |  |  |  | 5,796,000 |  |  |  |
3VR | ASC 805 |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition and transitional costs |  |  |  |  |  |  |  | $ 8,000 |  | 548,000
3VR | Notes Payable |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination, issuance of notes |  |  |  |  |  | 2,000,000 |  |  |  |
Debt instrument payment, principal and interest | $ 2,060,000 |  |  |  |  |  |  |  |  |
3VR | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Reduction in purchase consideration |  |  |  |  |  |  | $ 340,000 |  |  |
Reduction in goodwill |  |  |  |  |  |  | $ 340,000 |  |  |
Business combination, cancellation of common stock shares held back |  |  |  |  |  |  | 93,406 |  |  |
Percentage of contingent consideration obligated to pay |  |  |  |  |  |  |  |  | 35.00% |
Amount of contingent consideration obligated to pay for each subject adjustments |  |  |  |  |  |  |  |  | $ 25,000,000 |
3VR | Maximum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination, issuance of common stock value held back |  |  |  |  |  | $ 1,000,000 |  |  |  |
Thursby Software Systems |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Date of acquisition completed |  |  |  | Nov. 01, 2018 |  |  |  |  |  |
Business combination, aggregate consideration |  |  |  | $ 3,100,000 |  |  |  |  |  |
Business combination, payment of cash |  |  |  | $ 600,000 |  |  |  |  |  |
Business combination, issuance of common stock, shares |  |  |  | 426,621 |  |  |  |  |  |
Business combination, issuance of common stock |  |  |  | $ 2,500,000 |  |  |  |  |  |
Business combination, issuance of common stock shares held back |  |  |  | 85,324 |  |  |  |  |  |
Goodwill |  |  |  | $ 3,490,000 |  |  |  |  |  |
Product revenue to be achieved to obligate earn-out consideration |  |  |  | 11,000,000 |  |  |  |  |  |
Amount of additional earn-out consideration of payable in shares of common stock |  |  |  | 2,500,000 |  |  |  |  |  |
Amount of maximum earn-out consideration of payable for all periods in shares of common stock |  |  |  | 7,500,000 |  |  |  |  |  |
Thursby Software Systems | ASC 805 |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition and transitional costs |  |  |  |  |  |  |  | 23,000 |  | 208,000
Thursby Software Systems | Maximum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination, issuance of common stock value held back |  |  |  | 500,000 |  |  |  |  |  |
Product revenue to be achieved to obligate earn-out consideration |  |  |  | 15,000,000 |  |  |  |  |  |
Amount of earn-out consideration of payable in shares of common stock |  |  |  | 7,500,000 |  |  |  |  |  |
Product revenue to be achieved to obligate additional earn-out consideration |  |  |  | 15,000,000 |  |  |  |  |  |
Thursby Software Systems | Minimum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Product revenue to be achieved to obligate earn-out consideration |  |  |  | 8,000,000 |  |  |  |  |  |
Product revenue to be achieved to obligate additional earn-out consideration |  |  |  | $ 15,000,000 |  |  |  |  |  |
Viscount Systems, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Date of acquisition completed |  |  | Jan. 02, 2019 |  |  |  |  |  |  |
Business combination, aggregate consideration |  |  | $ 2,900,000 |  |  |  |  |  |  |
Business combination, payment of cash |  |  | $ 1,300,000 |  |  |  |  |  |  |
Business combination, issuance of common stock, shares |  |  | 419,288 |  |  |  |  |  |  |
Business combination, issuance of common stock |  |  | $ 1,600,000 |  |  |  |  |  |  |
Business combination, issuance of common stock shares held back |  |  | 31,446 |  |  |  |  |  |  |
Goodwill |  |  | $ 1,173,000 |  |  |  |  |  |  |
Amount of maximum earn-out consideration of payable for all periods in shares of common stock |  |  | 3,500,000 |  |  |  |  |  |  |
Fair value of earn out consideration |  |  | 200,000 |  |  |  |  | 200,000 |  |
Viscount Systems, Inc. | ASC 805 |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition and transitional costs |  |  |  |  |  |  |  | $ 27,000 |  | $ 227,000
Viscount Systems, Inc. | Maximum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of earn-out consideration of payable in shares of common stock |  |  | 3,500,000 |  |  |  |  |  |  |
Amount of additional earn-out consideration of payable in shares of common stock |  |  | $ 2,250,000 |  |  |  |  |  |  |

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