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Business Combinations - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 02, 2019 | Nov. 01, 2018 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2019 | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 10,138,000 | $ 10,238,000 | $ 10,238,000 |
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 |  | 85,324 |  |
Product revenue to be achieved to obligate earnout consideration |  | $ 11,000,000 |  |  |  |
Amount of additional earnout consideration of payable in shares of common stock |  | 2,500,000 |  |  |  |
Amount of maximum earnout consideration of payable for all periods in shares of common stock |  | 7,500,000 |  |  |  |
Goodwill |  | 3,554,000 |  |  |  |
Fair value of earnout consideration |  |  |  | $ 0 | 0 |
Thursby Software Systems | ASC 805 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition and transactional costs |  |  | $ 0 |  | 27,000 |
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 earnout consideration |  | 15,000,000 |  |  |  |
Amount of earnout consideration of payable in shares of common stock |  | 7,500,000 |  |  |  |
Product revenue to be achieved to obligate additional earnout consideration |  | 15,000,000 |  |  |  |
Thursby Software Systems | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Product revenue to be achieved to obligate earnout consideration |  | 8,000,000 |  |  |  |
Product revenue to be achieved to obligate additional earnout 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 | 31,447 |  | 31,447 |  |  |
Amount of maximum earnout consideration of payable for all periods in shares of common stock | $ 3,500,000 |  |  |  |  |
Goodwill | 1,200,000 |  |  |  |  |
Fair value of earnout consideration | 200,000 |  |  | $ 750,000 | 750,000 | $ 750,000
Business combination issuable to selling stockholder earnout consideration of shares |  |  | 157,233 |  |  |
Viscount Systems, Inc. | ASC 805 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition and transactional costs |  |  | $ 0 |  | $ 27,000 |
Viscount Systems, Inc. | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Amount of earnout consideration of payable in shares of common stock | 3,500,000 |  |  |  |  |
Amount of additional earnout consideration of payable in shares of common stock | $ 2,250,000 |  |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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