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Stock-Based Incentive Plans (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 16, 2017 | Apr. 26, 2016 | Jan. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  | $ 2,009,000 | $ 2,342,000 |  |  |  |
Employee Service Share-based Compensation, Awards with market Cond, Compensation Cost Not yet Recognized |  | 0 |  |  |  |  |
Non-cash stock compensation |  | $ 8,885,000 | $ 9,062,000 | $ 11,048,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 0.00 | $ 16.72 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Vested in Period, Fair Value |  | $ 200,000 | $ 324,000 | 480,000 |  |  |
Ownership percent of voting stock |  | 10.00% |  |  |  |  |
Aggregate intrinsic value of options exercised |  | $ 296,000 | 344,000 | $ 751,000 |  |  |
Weighted average grant date fair value of restricted stock granted |  | $ 0.00 |  |  |  |  |
Number of shares of common stock reserved for issuance |  | 7,279,000 |  |  |  |  |
Beneficial Ownership Percentage Limit |  | 4.90% |  |  | 60.00% |  |
Fair Value of Profits Interest |  | $ 3,041,000 |  |  | $ 722,000 |  |
Share Price |  |  |  | $ 4.29 |  |  | $ 16.72
Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Total unrecognized compensation expense for nonvested awards |  | $ 3,654,000 |  |  |  |  |
Weighted average period over which unrecognized compensation expense will be recognized |  | 2 years |  |  |  |  |
Restricted stock awards with time based vesting conditions [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Non-cash stock compensation |  | $ 1,025,000 | $ 4,071,000 | $ 10,575,000 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Weighted average grant date fair value of restricted stock granted |  |  | $ 3.12 | $ 12.83 |  |  |
Aggregate fair value of restricted stock vested |  | 1,560,000 | $ 5,243,000 | $ 11,494,000 |  |  |
Total unrecognized compensation expense for nonvested awards |  | $ 53,000 |  |  |  |  |
Weighted average period over which unrecognized compensation expense will be recognized |  | 2 months |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Total unrecognized compensation expense for nonvested awards |  | $ 1,000 |  |  |  |  |
Weighted average period over which unrecognized compensation expense will be recognized |  | 1 month |  |  |  |  |
Restricted stock unit awards with time-based vesting conditions [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Non-cash stock compensation |  | $ 161,000 | 320,000 | 473,000 |  |  |
Restricted stock unit awards with performance based vesting conditions [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Non-cash stock compensation |  | 121,000 | 197,000 | 0 |  |  |
Stock options with time-based vesting conditions [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Non-cash stock compensation |  | 2,165,000 | 1,316,000 | 0 |  |  |
Stock options with market-based vesting conditions [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Non-cash stock compensation |  | 2,372,000 | 3,158,000 | 0 |  |  |
Stock options with performance-based vesting conditions [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Non-cash stock compensation |  | 0 | 0 | 0 |  |  |
Deferred Profit Sharing [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Non-cash stock compensation |  | $ 3,041,000 | $ 0 | $ 0 |  |  |
2007 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Number of shares available for grant |  | 0 |  |  |  |  |
2016 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Aggregate shares available for issuance |  |  |  |  |  | 4,500,000 |
Number of shares available for grant |  | 727,000 |  |  |  |  |
Discretionary Option Grant Program [Member] | Nonstatutory Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of fair market value on grant date, minimum exercise price |  | 85.00% |  |  |  |  |
Stock Issuance Program [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of fair market value on grant date, minimum exercise price |  | 100.00% |  |  |  |  |
2013 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Aggregate shares available for issuance |  |  |  |  |  | 4,750,000 |
Number of shares available for grant |  | 660,000 |  |  |  |  |
2013 Stock Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  | 625,390 |
Less than 10% [Member] | Discretionary Option Grant Program [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of fair market value on grant date, minimum exercise price |  | 100.00% |  |  |  |  |
10% or More [Member] | Discretionary Option Grant Program [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Percentage of fair market value on grant date, minimum exercise price |  | 110.00% |  |  |  |  |
Geometric Brownian Motion [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Fair Value Assumptions, Expected Term |  | 4 years 5 months |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate |  | 50.00% |  |  |  |  |
Finnerty - Profits Interests [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Term specific volatility |  | 85.00% |  |  |  |  |
Fair Value Inputs, Discount for Lack of Marketability |  | 30.00% |  |  |  |  |
Minimum [Member] | Geometric Brownian Motion [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Fair Value Assumptions, Expected Term | 1 year |  |  |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate |  | 2.00% |  |  |  |  |
Minimum [Member] | Veritone [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Share Price |  | $ 23.20 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate |  | 50.00% |  |  |  |  |
Maximum [Member] | Geometric Brownian Motion [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Fair Value Assumptions, Expected Term | 10 years |  |  |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate |  | 2.00% |  |  |  |  |

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