Investments Investments (Details) - USD ($)		3 Months Ended		12 Months Ended
	May 17, 2017	Mar. 31, 2018	Mar. 31, 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%		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		50,647,882		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			$ 1,000,000
Accretion (Amortization) of Discounts and Premiums, Investments			369,000
Percentage of ownership, Veritone	20.00%
Investments at fair value		$ 63,657,000		$ 104,754,000
Revenues		62,093,000	$ 8,854,000
Assets, Current		188,203,000		139,695,000
Total assets		317,835,000		308,768,000
Current liabilities		48,977,000		9,557,000
Total liabilities		50,782,000		13,109,000
Stockholders' Equity Attributable to Parent		$ 265,460,000		294,301,000
Equity Method Investment, Ownership Percentage		23.00%
Cumulative Unrealized Gain (Loss) Since Inception		$ 8,429,000
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)			48.00%
Veritone [Member]
Investment [Line Items]
Investment Income, Interest		$ 21,000
Revenues				14,413,000
Gross Profit				1,070,000
Operating Expenses				60,105,000
Other Operating Income (Expense), Net				(12,833,000)
Net Income (Loss) Available to Common Stockholders, Diluted				$ (64,071,000)
Earnings Per Share, Basic				$ (6,200)
Assets, Current				$ 83,805,000
Noncurrent assets				4,753,000
Total assets				88,558,000
Current liabilities				27,256,000
Noncurrent liabilities				0
Total liabilities				27,256,000
Preferred Stock, Value, Outstanding				0
Stockholders' Equity Attributable to Parent				61,302,000
Total liabilities, preferred stock and stockholders' equity				$ 88,558,000
Common Stock [Member]
Investment [Line Items]
Investment Owned, Balance, Shares				4,119,521
Investments at fair value		57,345,000
Warrant [Member]
Investment [Line Items]
Investment Owned, Balance, Shares				1,120,432
Investments at fair value		$ 6,312,000
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 Inputs, Discount for Lack of Marketability		30.00%
Fair Value Assumptions, Expected Term		4 years 1 month
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		50.00%
Fair Value Assumptions, Risk Free Interest Rate		2.30%
Fair Value Assumptions, Expected Term		2 years
Black Scholes [Member] | Maximum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate		55.00%
Fair Value Assumptions, Risk Free Interest Rate		2.70%
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		51.00%		72.00%
Fair Value Inputs, Discount for Lack of Marketability		5.00%
Finnerty - Warrants [Member] | Maximum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate		91.00%		87.00%
Fair Value Inputs, Discount for Lack of Marketability		15.00%