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Investments Investments (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 17, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Mar. 14, 2017 | Aug. 15, 2016
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in Miso Robotics |  | $ 6,000,000 |  |  |  |  |  | $ 2,250,000 |  |
Percentage of ownership, Miso Robotics |  | 30.00% |  |  |  | 30.00% |  | 22.60% |  |
Maximum Investment in Veritone |  |  |  |  |  |  |  |  |  | $ 50,000,000
Secured Convertible Promissory Note |  |  |  |  |  |  |  |  |  | 20,000,000
Secured Promissory Note Advance |  |  |  |  |  |  |  |  |  | $ 10,000,000
Time-sharing Transactions, Stated Interest Rate for Notes Receivable |  |  |  |  |  |  |  |  |  | 6.00%
First Loan Warrant |  |  |  |  |  |  |  |  |  | $ 700,000
Debt Instrument, Convertible, Conversion Price | $ 13.6088 |  |  |  |  |  |  |  |  |
Loan receivable and accrued interest | $ 20,700,000 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  | 49,639,319 |  |  |  | 49,639,319 |  | 50,639,926 |  |
Veritone Primary Warrant |  |  |  |  |  |  |  |  |  | $ 50,000,000
Cash paid for primary warrant exercise | $ 29,300,000 |  |  |  |  |  |  |  |  |
10% Warrant | 809,400 |  |  |  |  |  |  |  |  |
Veritone Bridge Loan | $ 4,000,000 |  |  |  |  |  |  |  | $ 4,000,000 |
Bridge loan stated interest rate |  |  |  |  |  |  |  |  | 8.00% |
Veritone Bridge Loan Advance 1 |  |  |  |  |  |  |  |  | $ 1,000,000 |
Veritone Bridge Loan Advance 3 and 4 |  |  |  |  |  |  |  |  | $ 2,000,000 |
Upfront Shares |  |  |  |  |  |  |  |  | 60,000 |
Bridge Installment Shares |  |  |  |  |  |  |  |  | 90,000 |
Bridge Warrant Share |  |  |  |  |  |  |  |  | 157,000 |
Interest Income, Other |  |  |  | $ 1,100,000 |  |  |  |  |  |
Accretion (Amortization) of Discounts and Premiums, Investments |  |  |  |  |  |  | $ 630,000 |  |  |
Percentage of ownership, Veritone | 20.00% |  |  |  |  |  |  |  |  |
Shares of Investment Sold |  | 1,000,000 |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  | $ 10.44 |  |  |  | $ 10.44 |  |  |  |
Investments at fair value |  | $ 36,648,000 |  |  |  | $ 36,648,000 |  | $ 104,754,000 |  |
Revenues |  | 13,725,000 |  | 36,633,000 |  | 82,303,000 | 61,944,000 |  |  |
Net Income (Loss) Available to Common Stockholders, Diluted |  | $ (33,195,000) |  | $ 158,326,000 |  | $ (93,660,000) | $ 132,143,000 |  |  |
Earnings Per Share, Basic |  | $ (0.67) |  | $ 3.13 |  | $ (1.87) | $ 2.62 |  |  |
Assets, Current |  | $ 157,103,000 |  |  |  | $ 157,103,000 |  | 139,695,000 |  |
Total assets |  | 220,276,000 |  |  |  | 220,276,000 |  | 308,768,000 |  |
Current liabilities |  | 16,260,000 |  |  |  | 16,260,000 |  | 9,557,000 |  |
Total liabilities |  | 18,134,000 |  |  |  | 18,134,000 |  | 13,109,000 |  |
Stockholders' Equity Attributable to Parent |  | $ 200,298,000 |  |  |  | $ 200,298,000 |  | 294,301,000 |  |
Equity Method Investment, Ownership Percentage |  | 15.00% |  |  |  | 15.00% |  |  |  |
Cumulative Unrealized Gain (Loss) Since Inception |  | $ 8,140,000 |  |  |  | $ 8,140,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Receivable with Imputed Interest, Effective Yield (Interest Rate) |  |  |  |  |  | 9.00% |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate |  |  |  |  |  | 50.00% |  |  |  |
Fair Value Inputs, Probability of Default |  |  |  |  |  | 75.00% |  |  |  |
Fair value inputs recovery |  |  |  |  |  | 100.00% |  |  |  |
Receivable with Imputed Interest, Effective Yield (Interest Rate) |  |  |  |  |  |  | 53.00% |  |  |
Veritone [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Investment Income, Interest |  |  |  |  |  | $ 21,000 |  |  |  |
Revenues |  |  | $ 4,168,000 |  | $ 8,556,000 |  |  |  |  |
Gross Profit |  |  | 3,348,000 |  | 7,172,000 |  |  |  |  |
Operating Expenses |  |  | 17,081,000 |  | 34,855,000 |  |  |  |  |
Other Operating Income (Expense), Net |  |  | 133,000 |  | 316,000 |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Diluted |  |  | $ (14,330,000) |  | $ (27,379,000) |  |  |  |  |
Earnings Per Share, Basic |  |  | $ (880) |  | $ (1,690) |  |  |  |  |
Assets, Current |  |  | $ 97,833,000 |  | $ 97,833,000 |  |  | 83,805,000 |  |
Noncurrent assets |  |  | 7,190,000 |  | 7,190,000 |  |  | 4,753,000 |  |
Total assets |  |  | 105,023,000 |  | 105,023,000 |  |  | 88,558,000 |  |
Current liabilities |  |  | 32,027,000 |  | 32,027,000 |  |  | 27,256,000 |  |
Noncurrent liabilities |  |  | 473,000 |  | 473,000 |  |  | 0 |  |
Total liabilities |  |  | 32,500,000 |  | 32,500,000 |  |  | 27,256,000 |  |
Preferred Stock, Value, Outstanding |  |  | 0 |  | 0 |  |  | 0 |  |
Stockholders' Equity Attributable to Parent |  |  | 72,523,000 |  | 72,523,000 |  |  | 61,302,000 |  |
Total liabilities, preferred stock and stockholders' equity |  |  | $ 105,023,000 |  | $ 105,023,000 |  |  | $ 88,558,000 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares |  |  |  |  |  |  |  | 3,119,521 |  |
Investments at fair value |  | 32,538,000 |  |  |  | 32,538,000 |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares |  |  |  |  |  |  |  | 1,120,432 |  |
Investments at fair value |  | $ 4,110,000 |  |  |  | $ 4,110,000 |  |  |  |
Veritone Loans [Member] | Veritone [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 1,523,746 |  |  |  |  |  |  |  |  |
Primary warrant [Member] | Veritone [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 2,150,335 |  |  |  |  |  |  |  |  |
Bridge Loan [Member] | Veritone [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 295,440 |  |  |  |  |  |  |  |  |
Finnerty - Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate | 35.00% | 0.00% |  |  |  |  |  | 37.00% |  |
Fair Value Inputs, Discount for Lack of Marketability | 6.00% | 0.00% |  |  |  |  |  | 5.00% |  |
Fair Value Assumptions, Expected Term | 6 months | 0 months |  |  |  |  |  | 2 months |  |
Monte Carlo [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate |  |  |  |  |  | 40.00% |  |  |  |
Fair Value Inputs, Probability of Default |  |  |  |  |  | 25.00% |  |  |  |
Fair Value Inputs, Discount for Lack of Marketability |  |  |  |  |  | 7.00% |  |  |  |
Finnerty [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Term |  |  |  |  |  | 4 years |  |  |  |
Finnerty [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Discount for Lack of Marketability |  |  |  |  |  | 27.00% |  |  |  |
Finnerty [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Discount for Lack of Marketability |  |  |  |  |  | 30.00% |  |  |  |
Black Scholes [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Dividend Payments |  |  |  |  |  | $ 0 |  |  |  |
Black Scholes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate |  |  |  |  |  | 70.00% |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate |  |  |  |  |  | 2.81% |  |  |  |
Fair Value Assumptions, Expected Term |  |  |  |  |  | 2 years |  |  |  |
Black Scholes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate |  |  |  |  |  | 3.03% |  |  |  |
Fair Value Assumptions, Expected Term |  |  |  |  |  | 9 years |  |  |  |
Finnerty - Warrants [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate | 35.00% |  |  |  |  |  |  |  |  |
Fair Value Inputs, Discount for Lack of Marketability | 6.00% |  |  |  |  |  |  | 10.00% |  |
Fair Value Assumptions, Expected Term | 6 months | 2 years |  |  |  |  |  | 5 months |  |
Finnerty - Warrants [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate |  | 70.00% |  |  |  |  |  | 72.00% |  |
Fair Value Inputs, Discount for Lack of Marketability |  | 20.00% |  |  |  |  |  |  |  |
Finnerty - Warrants [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate |  |  |  |  |  |  |  | 87.00% |  |
Fair Value Inputs, Discount for Lack of Marketability |  | 31.00% |  |  |  |  |  |  |  |

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