Investments Investments (Details) - USD ($)		3 Months Ended			6 Months Ended		12 Months Ended
	May 17, 2017	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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		49,495,064			49,495,064		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%
Investments at fair value		$ 75,004,000			$ 75,004,000		$ 104,754,000
Revenues		6,485,000		$ 16,457,000	$ 68,578,000	$ 25,311,000
Earnings Per Share, Basic					$ (1.20)	$ (0.52)
Assets, Current		143,982,000			$ 143,982,000		139,695,000
Total assets		250,467,000			250,467,000		308,768,000
Current liabilities		13,620,000			13,620,000		9,557,000
Total liabilities		16,091,000			16,091,000		13,109,000
Stockholders' Equity Attributable to Parent		$ 232,863,000			$ 232,863,000		294,301,000
Equity Method Investment, Ownership Percentage		19.00%			19.00%
Cumulative Unrealized Gain (Loss) Since Inception		$ 19,776,000			$ 19,776,000
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			$ 4,388,000
Gross Profit			3,824,000
Operating Expenses			17,054,000
Other Operating Income (Expense), Net			183,000
Net Income (Loss) Available to Common Stockholders, Diluted			$ (13,049,000)
Earnings Per Share, Basic			$ (810)
Assets, Current			$ 71,567,000				83,805,000
Noncurrent assets			6,161,000				4,753,000
Total assets			77,728,000				88,558,000
Current liabilities			26,582,000				27,256,000
Noncurrent liabilities			0				0
Total liabilities			26,582,000				27,256,000
Preferred Stock, Value, Outstanding			0				0
Stockholders' Equity Attributable to Parent			51,146,000				61,302,000
Total liabilities, preferred stock and stockholders' equity			$ 77,728,000				$ 88,558,000
Common Stock [Member]
Investment [Line Items]
Investment Owned, Balance, Shares							4,119,521
Investments at fair value		65,827,000			65,827,000
Warrant [Member]
Investment [Line Items]
Investment Owned, Balance, Shares							1,120,432
Investments at fair value		$ 9,177,000			$ 9,177,000
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%	5.00%					5.00%
Fair Value Assumptions, Expected Term	6 months	2 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 Inputs, Discount for Lack of Marketability					30.00%
Fair Value Assumptions, Expected Term					3 years 11 months
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					60.00%
Fair Value Assumptions, Risk Free Interest Rate					2.52%
Fair Value Assumptions, Expected Term					2 years
Black Scholes [Member] | Maximum [Member]
Investment [Line Items]
Fair Value Assumptions, Risk Free Interest Rate					2.81%
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	5 months					5 months
Finnerty - Warrants [Member] | Minimum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate		66.00%					72.00%
Fair Value Inputs, Discount for Lack of Marketability		10.00%
Finnerty - Warrants [Member] | Maximum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate		110.00%					87.00%
Fair Value Inputs, Discount for Lack of Marketability		15.00%