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Stockholders Equity - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) shares | Nov. 30, 2018 USD ($) shares | Dec. 31, 2020 USD ($) Vote $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Jan. 01, 2020 shares | Jan. 01, 2019 shares | Jan. 01, 2017 shares | Nov. 30, 2014 shares
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 1,000,000 |  |  |  |  |
Common stock, shares authorized | 137,500,000 |  | 137,500,000 | 137,500,000 |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.01 |  |  |  |  |
Options granted with exercise prices less than current market value, Shares |  |  | 0 | 0 |  |  |  |
Income tax benefit related to stock-based compensation included in net loss | $ |  |  | $ 0 | $ 0 |  |  |  |
Options forfeited |  |  | 133,000 |  |  |  |  |
Unrecognized stock option compensation not yet recognized | $ |  |  | $ 1,400,000 |  |  |  |  |
Proceed from exercise of stock option | $ |  |  | $ 0 | $ 1.8 |  |  |  |
Stock purchased by eligible employee |  |  | 41,987 |  |  |  |  |
Equity Option |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost, weighted average recognition period |  |  | 2 years 10 months 24 days |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost, weighted average recognition period |  |  | 3 years 8 months 12 days |  |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 3,000,000.0 |  |  |  |  |
Stock Incentive Plan 2012 |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock incentive plan, annual increase as a percentage of outstanding common stock |  |  | 5.00% |  |  |  |  |
Stock incentive plan, options term |  |  | 10 years |  |  |  |  |
Stock incentive plan, options annual vesting percentage |  |  | 25.00% |  |  |  |  |
Stock incentive plan, vesting period |  |  | 4 years |  |  |  |  |
Stock Incentive Plan 2012 | Restricted Stock Units |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock incentive plan, options annual vesting percentage |  |  | 25.00% |  |  |  |  |
Stock incentive plan, vesting period |  |  | 4 years |  |  |  |  |
Employee Stock Purchase Plan Twenty Fourteen |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock incentive plan, shares authorized |  |  | 225,000 |  |  |  |  |
Percentage of compensation eligible for purchase of stock |  |  | 15.00% |  |  |  |  |
Maximum value of stock employee is permitted to purchase in any calendar year | $ |  |  | $ 25,000 |  |  |  |  |
Stock purchased by eligible employee |  |  |  | 12,200 |  |  |  |
Maximum |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock purchased by eligible employee, price per share | $ / shares |  |  | $ 2.01 |  |  |  |  |
Maximum | Stock Incentive Plan 2012 |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock incentive plan, shares authorized |  |  |  |  |  |  | 22,214,886 |
Maximum | Stock Incentive Plan 2012 | Equity Option |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock incentive plan, shares authorized |  |  | 3,500,000 |  |  |  |  |
Maximum | Employee Stock Purchase Plan Twenty Fourteen |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock purchased by eligible employee, price per share | $ / shares |  |  |  | $ 4.49 |  |  |  |
Minimum |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock purchased by eligible employee, price per share | $ / shares |  |  | $ 1.38 |  |  |  |  |
Minimum | Stock Incentive Plan 2012 |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock incentive plan, shares authorized |  |  |  |  | 2,056,116 | 2,213,550 |  |
Minimum | Employee Stock Purchase Plan Twenty Fourteen |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock purchased by eligible employee, price per share | $ / shares |  |  |  | $ 2.982 |  |  |  |
Callcap Acquisition |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  | 100.00% |  |  |  |  |  |
Cash paid for business acquisition | $ |  | $ 25,000,000 |  |  |  |  |  |
Sonar Acquisition |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired | 100.00% |  |  | 100.00% |  |  |  |
Cash paid for business acquisition | $ | $ 8,496,000 |  |  |  |  |  |  |
Two Officers |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Options forfeited |  |  | 1,500,000 |  |  |  |  |
Class B |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized | 125,000,000 |  | 125,000,000 | 125,000,000 |  |  |  |
Votes per share | Vote |  |  | 1 |  |  |  |  |
Number of shares authorized to be repurchased |  |  |  |  |  |  |  | 3,000,000
Treasury stock acquired, shares |  |  |  | 90,000 |  |  |  |
Treasury stock acquired, value | $ |  |  |  | $ 900,000 |  |  |  |
Treasury stock repurchased | $ / shares |  |  |  | $ 0.01 |  |  |  |
Total Share Repurchase Amount | $ |  |  | $ 10,800,000 |  |  |  |  |
Total Number of Shares Repurchased |  |  | 5,000,000 |  |  |  |  |
Class B | Employee Stock Purchase Plan Twenty Fourteen |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Common stock purchase price as a percentage of fair value |  |  | 95.00% |  |  |  |  |
Class B | Maximum | Stock Incentive Plan 2012 |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock incentive plan, shares authorized |  |  | 2,000,000 |  |  |  |  |
Class B | Callcap Acquisition |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock issued during the period, shares |  | 3,400,000 |  |  |  |  |  |
Common stock issuance period |  | 4 years |  |  |  |  |  |
Class B | Sonar Acquisition |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Stock issued during the period, shares | 1,000,000.0 |  |  |  |  |  |  |
Common stock issuance period | 3 years |  |  |  |  |  |  |
Class B | Sonar Acquisition | Maximum |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Future earnout consideration, shares | 389,000 |  |  | 389,000 |  |  |  |
Class B | Edenbrook Capital LLC [Member] |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Tender Offer Completed For Purchase of Share |  |  | 10,000,000 |  |  |  |  |
Tender Offer Completed Value Per Share | $ / shares |  |  | $ 2.15 |  |  |  |  |
Class A |  |  |  |  |  |  |  |
Shareholders Equity And Share Based Payments [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized | 12,500,000 |  | 12,500,000 | 12,500,000 |  |  |  |
Votes per share | Vote |  |  | 25 |  |  |  |  |

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