<?xml version="1.0" encoding="UTF-8"?>
<informationTable
	xsi:schemaLocation="http://www.sec.gov/edgar/document/thirteenf/informationtable eis_13FDocument.xsd"
	xmlns="http://www.sec.gov/edgar/document/thirteenf/informationtable"
	xmlns:n1="http://www.sec.gov/edgar/document/thirteenf/informationtable"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<infoTable>
		<nameOfIssuer>AEMETIS INC</nameOfIssuer>
		<titleOfClass>COM NEW</titleOfClass>
		<cusip>00770K202</cusip>
		<value>52</value>
		<shrsOrPrnAmt>
			<sshPrnamt>25000</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>25000</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>ANTERO RES CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>03674X106</cusip>
		<value>55863</value>
		<shrsOrPrnAmt>
			<sshPrnamt>2246194</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>2246194</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>APPLE INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>037833100</cusip>
		<value>3288</value>
		<shrsOrPrnAmt>
			<sshPrnamt>30168</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>30168</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>BEIGENE LTD</nameOfIssuer>
		<titleOfClass>SPONSORED ADR</titleOfClass>
		<cusip>07725L102</cusip>
		<value>1466</value>
		<shrsOrPrnAmt>
			<sshPrnamt>50000</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>50000</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>CARE COM INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>141633107</cusip>
		<value>122</value>
		<shrsOrPrnAmt>
			<sshPrnamt>19773</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>19773</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>FATE THERAPEUTICS INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>31189P102</cusip>
		<value>515</value>
		<shrsOrPrnAmt>
			<sshPrnamt>285953</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>285953</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>HAWAIIAN ELEC INDUSTRIES</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>419870100</cusip>
		<value>249</value>
		<shrsOrPrnAmt>
			<sshPrnamt>7680</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>7680</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>ISHARES INC</nameOfIssuer>
		<titleOfClass>CORE MSCI EMKT</titleOfClass>
		<cusip>46434G103</cusip>
		<value>191630</value>
		<shrsOrPrnAmt>
			<sshPrnamt>4604269</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>4604269</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>ISHARES</nameOfIssuer>
		<titleOfClass>MSCI JAPAN ETF</titleOfClass>
		<cusip>464286848</cusip>
		<value>125069</value>
		<shrsOrPrnAmt>
			<sshPrnamt>10961387</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>10961387</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>JD COM INC</nameOfIssuer>
		<titleOfClass>SPON ADR CL A</titleOfClass>
		<cusip>47215P106</cusip>
		<value>266738</value>
		<shrsOrPrnAmt>
			<sshPrnamt>10065573</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>10065573</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>ON DECK CAP INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>682163100</cusip>
		<value>187</value>
		<shrsOrPrnAmt>
			<sshPrnamt>24044</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>24044</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>PG&amp;E CORP</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>69331C108</cusip>
		<value>208</value>
		<shrsOrPrnAmt>
			<sshPrnamt>3488</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>3488</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>PURE STORAGE INC</nameOfIssuer>
		<titleOfClass>CL A</titleOfClass>
		<cusip>74624M102</cusip>
		<value>5989</value>
		<shrsOrPrnAmt>
			<sshPrnamt>437502</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>437502</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>QUINSTREET INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>74874Q100</cusip>
		<value>202</value>
		<shrsOrPrnAmt>
			<sshPrnamt>58824</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>58824</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>SUNRUN INC</nameOfIssuer>
		<titleOfClass>COM</titleOfClass>
		<cusip>86771W105</cusip>
		<value>282</value>
		<shrsOrPrnAmt>
			<sshPrnamt>43562</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>43562</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>VANGUARD INTL EQUITY INDEX F</nameOfIssuer>
		<titleOfClass>FTSE EUROPE ETF</titleOfClass>
		<cusip>922042874</cusip>
		<value>72424</value>
		<shrsOrPrnAmt>
			<sshPrnamt>1492043</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>1492043</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
	<infoTable>
		<nameOfIssuer>DISNEY WALT CO</nameOfIssuer>
		<titleOfClass>COM DISNEY</titleOfClass>
		<cusip>254687106</cusip>
		<value>6675</value>
		<shrsOrPrnAmt>
			<sshPrnamt>67209</sshPrnamt>
			<sshPrnamtType>SH</sshPrnamtType>
		</shrsOrPrnAmt>
		<investmentDiscretion>SOLE</investmentDiscretion>
		<votingAuthority>
			<Sole>67209</Sole>
			<Shared>0</Shared>
			<None>0</None>
		</votingAuthority>
	</infoTable>
</informationTable>
