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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) Segment shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | May 15, 2019 shares | Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock split description | two-for-one |  |  |  |  |
Bad debt (credit) expense |  | $ 80,000 | $ 10,000 |  |  |
Number of reportable segment | Segment | 2 |  |  |  |  |
Percentage of billing expense revenues | 2.00% |  |  |  |  |
Stock Incentive Plan, shares available for issuance | shares | 4,900,000 |  |  |  |  |
Treasury stock, shares | shares | 1,646,420 | 1,646,420 |  |  |  |
Treasury stock, at cost | $ 4,187,000 | $ 4,187,000 |  |  |  |
Expiration period of stock repurchase program | Dec. 22, 2016 |  |  |  |  |
Lease asset | $ 3,286,000 | 4,617,000 |  |  |  | $ 5,700,000
Lease liability | 3,404,000 | 4,717,000 |  |  |  | $ 5,700,000
Allowance for uncollectible accounts | 413,000 | 338,000 |  |  |  |
Goodwill impairment loss |  |  | 9,738,000 |  |  |
Revaluation of contingent consideration liability |  | (6,069,000) | (11,056,000) |  |  |
Business combination contingent consideration liability | $ 2,882,000 |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares available for future grants | shares | 539,041 |  |  |  | 600,000 |
Minimum [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Vesting period | 5 years |  |  |  |  |
Info Trellis Inc [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Bad debt (credit) expense | $ 0 | 80,000 | 10,000 |  |  |
Depreciation and amortization expense related to fixed assets | 799,000 | 746,000 | 455,000 |  |  |
Impairment on goodwill and intangible assets | 0 |  |  |  |  |
Valuation allowance provided | 179,000 | 7,000 |  |  |  |
Estimated one-time, non-cash charge related to enactment of Tax and Jobs Act of 2017 |  |  |  | $ 372,000 |  |
Re-measurement of deferred tax assets arising from a lower U.S. corporate tax rate |  |  |  | 294,000 |  |
One-time transition tax applicable to new dividend exemption system related to foreign earnings |  |  |  | $ 78,000 |  |
Deferred tax assets additional expense |  |  | 86,000 |  |  |
Uncertain tax positions | 0 | 20,000 |  |  |  |
One-time transition tax applicable to new dividend exemption system related to foreign earnings |  |  | 165,000 |  |  |
Allowance for uncollectible accounts | 413,000 | 338,000 |  |  |  |
Goodwill impairment loss |  |  | 9,700,000 |  |  |
Revaluation of contingent consideration liability |  | $ 6,100,000 | $ 11,100,000 |  |  |
Info Trellis Inc [Member] | Enterprise Software [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Software development cost capitalized | $ 2,400,000 |  |  |  |  |
Info Trellis Inc [Member] | Minimum [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life, intangible assets | 3 years |  |  |  |  |
Info Trellis Inc [Member] | Maximum [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life, intangible assets | 12 years |  |  |  |  |
AmberLeaf [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Revaluation of contingent consideration liability | $ 0 |  |  |  |  |
Business combination contingent consideration liability | $ 2,900,000 |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Info Trellis Inc [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of billing expense revenues | 2.00% |  |  |  |  |

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