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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 segment | Dec. 31, 2018 USD ($) segment | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Accounts payable |  | $ 7,855,000 | $ 7,855,000 | $ 7,408,000 |
Accrued expenses and other current liabilities |  | 21,566,000 | 21,566,000 | 14,967,000 |
Decrease in accounts payable |  |  | 249,000 | (2,864,000) |
Increase in accrued expenses and other current liabilities |  |  | $ 6,771,000 | $ 5,594,000 |
Basic and diluted (in shares) | shares |  |  | 76,705,877 | 61,153,069 |
Income (loss) from continuing operations, per basic and diluted share (in dollars per share) | $ / shares |  |  | $ (0.04) | $ 0.52 |
Income (loss) from discontinued operations, per basic and diluted share (in dollars per share) | $ / shares |  |  | 0.28 | 0.35 |
Basic and diluted loss per share (in dollars per share) | $ / shares |  |  | $ 0.23 | $ 0.87 |
Allowance for doubtful accounts receivable |  | $ 1,751,000 | $ 1,751,000 | $ 1,624,000 | $ 679,000
Impairment of finite-lived intangible assets |  |  | 0 | 0 |
Number of reportable segments | segment | 2 | 1 |  |  |
Number of operating segments | segment | 2 | 1 |  |  |
Goodwill impairment |  | $ 0 | 0 | 0 |
Deferred revenue |  | 444,000 | 444,000 | 265,000 |
Unbilled receivables, current |  | $ 25,545,000 | 25,545,000 | 16,238,000 |
Advertising and promotion costs |  |  | 1,471,000 | 1,420,000 |
Impairment of long lived assets |  |  | $ 0 | 0 |
Minimum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life of intangible assets |  |  | 2 years |  |
Maximum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life of intangible assets |  |  | 20 years |  |
Scenario, Adjustment |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Accounts payable |  |  |  | (3,258,000) |
Accrued expenses and other current liabilities |  |  |  | 3,258,000 |
Decrease in accounts payable |  |  |  | 274,000 |
Increase in accrued expenses and other current liabilities |  |  |  | $ (274,000) |
Restatement Adjustment |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Basic and diluted (in shares) | shares |  |  |  | 5,504,834 |
Previously Reported |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Basic and diluted (in shares) | shares |  |  |  | 55,648,235 |
Income (loss) from continuing operations, per basic and diluted share (in dollars per share) | $ / shares |  |  |  | $ 0.57 |
Income (loss) from discontinued operations, per basic and diluted share (in dollars per share) | $ / shares |  |  |  | 0.39 |
Basic and diluted loss per share (in dollars per share) | $ / shares |  |  |  | $ 0.96 |

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