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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