<?xml version="1.0" ?>
<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>BOOKING HOLDINGS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>09857L108</cusip>
    <value>10519</value>
    <shrsOrPrnAmt>
      <sshPrnamt>5611</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>5611</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>ALLOGENE THERAPEUTICS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>019770106</cusip>
    <value>14289</value>
    <shrsOrPrnAmt>
      <sshPrnamt>532166</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>532166</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>COSTAR GROUP INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>22160N109</cusip>
    <value>66704</value>
    <shrsOrPrnAmt>
      <sshPrnamt>120392</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>120392</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>EDITAS MEDICINE INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>28106W103</cusip>
    <value>4593</value>
    <shrsOrPrnAmt>
      <sshPrnamt>185668</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>185668</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>ENTERA BIO LTD</nameOfIssuer>
    <titleOfClass>SHS</titleOfClass>
    <cusip>M40527109</cusip>
    <value>697</value>
    <shrsOrPrnAmt>
      <sshPrnamt>203190</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>203190</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>FACEBOOK INC</nameOfIssuer>
    <titleOfClass>CL A</titleOfClass>
    <cusip>30303M102</cusip>
    <value>12845</value>
    <shrsOrPrnAmt>
      <sshPrnamt>66553</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>66553</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>GRITSTONE ONCOLOGY INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>39868T105</cusip>
    <value>2167</value>
    <shrsOrPrnAmt>
      <sshPrnamt>194499</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>194499</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>GOOSEHEAD INS INC</nameOfIssuer>
    <titleOfClass>COM CL A</titleOfClass>
    <cusip>38267D109</cusip>
    <value>3324</value>
    <shrsOrPrnAmt>
      <sshPrnamt>69533</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>69533</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>NANTKWEST INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>63016Q102</cusip>
    <value>568</value>
    <shrsOrPrnAmt>
      <sshPrnamt>556453</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>556453</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>PLAYA HOTELS &amp; RESORTS NV</nameOfIssuer>
    <titleOfClass>SHS</titleOfClass>
    <cusip>N70544106</cusip>
    <value>2313</value>
    <shrsOrPrnAmt>
      <sshPrnamt>300000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>300000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>SABINE ROYALTY TR</nameOfIssuer>
    <titleOfClass>UNIT BEN INT</titleOfClass>
    <cusip>785688102</cusip>
    <value>16157</value>
    <shrsOrPrnAmt>
      <sshPrnamt>335564</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>335564</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>SIENNA BIOPHARMACEUTICALS IN</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>82622H108</cusip>
    <value>257</value>
    <shrsOrPrnAmt>
      <sshPrnamt>295613</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>295613</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>SORRENTO THERAPEUTICS INC</nameOfIssuer>
    <titleOfClass>COM NEW</titleOfClass>
    <cusip>83587F202</cusip>
    <value>1110</value>
    <shrsOrPrnAmt>
      <sshPrnamt>415765</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>415765</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>UROGEN PHARMA LTD</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>M96088105</cusip>
    <value>18774</value>
    <shrsOrPrnAmt>
      <sshPrnamt>522361</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>522361</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>BEYOND MEAT INC</nameOfIssuer>
    <titleOfClass>CALL</titleOfClass>
    <cusip>08862E909</cusip>
    <value>1120</value>
    <shrsOrPrnAmt>
      <sshPrnamt>27072</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <putCall>Call</putCall>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>27072</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>VANECK VECTORS ETF TR</nameOfIssuer>
    <titleOfClass>PUT</titleOfClass>
    <cusip>92189F156</cusip>
    <value>192</value>
    <shrsOrPrnAmt>
      <sshPrnamt>80000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <putCall>Put</putCall>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>80000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>UNITED STATES NATL GAS FUND</nameOfIssuer>
    <titleOfClass>CALL</titleOfClass>
    <cusip>912318900</cusip>
    <value>3</value>
    <shrsOrPrnAmt>
      <sshPrnamt>4000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <putCall>Call</putCall>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>4000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>UNITED STATES NATL GAS FUND</nameOfIssuer>
    <titleOfClass>PUT</titleOfClass>
    <cusip>912318950</cusip>
    <value>1248</value>
    <shrsOrPrnAmt>
      <sshPrnamt>534400</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <putCall>Put</putCall>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>534400</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>SELECT SECTOR SPDR TR</nameOfIssuer>
    <titleOfClass>CALL</titleOfClass>
    <cusip>81369Y906</cusip>
    <value>3325</value>
    <shrsOrPrnAmt>
      <sshPrnamt>423500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <putCall>Call</putCall>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>423500</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>SELECT SECTOR SPDR TR</nameOfIssuer>
    <titleOfClass>PUT</titleOfClass>
    <cusip>81369Y956</cusip>
    <value>2149</value>
    <shrsOrPrnAmt>
      <sshPrnamt>289800</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <putCall>Put</putCall>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>289800</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>SELECT SECTOR SPDR TR</nameOfIssuer>
    <titleOfClass>CALL</titleOfClass>
    <cusip>81369Y906</cusip>
    <value>320</value>
    <shrsOrPrnAmt>
      <sshPrnamt>135200</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <putCall>Call</putCall>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>135200</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>NANTHEALTH INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>630104107</cusip>
    <value>43</value>
    <shrsOrPrnAmt>
      <sshPrnamt>81870</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>81870</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>UROGEN PHARMA LTD</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>M96088105</cusip>
    <value>11537</value>
    <shrsOrPrnAmt>
      <sshPrnamt>321004</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>321004</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>SPDR GOLD TRUST</nameOfIssuer>
    <titleOfClass>GOLD SHS</titleOfClass>
    <cusip>78463V107</cusip>
    <value>17934</value>
    <shrsOrPrnAmt>
      <sshPrnamt>134643</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>134643</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>ISHARES TR</nameOfIssuer>
    <titleOfClass>IBOXX HI YD ETF</titleOfClass>
    <cusip>464288513</cusip>
    <value>6479</value>
    <shrsOrPrnAmt>
      <sshPrnamt>74648</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>74648</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>ISHARES TR</nameOfIssuer>
    <titleOfClass>IBOXX INV CP ETF</titleOfClass>
    <cusip>464287242</cusip>
    <value>9579</value>
    <shrsOrPrnAmt>
      <sshPrnamt>77237</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>77237</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>ISHARES TR</nameOfIssuer>
    <titleOfClass>JPMORGAN USD EMG</titleOfClass>
    <cusip>464288281</cusip>
    <value>7932</value>
    <shrsOrPrnAmt>
      <sshPrnamt>70289</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>70289</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>VANGUARD WHITEHALL FDS INC</nameOfIssuer>
    <titleOfClass>HIGH DIV YLD</titleOfClass>
    <cusip>921946406</cusip>
    <value>2830</value>
    <shrsOrPrnAmt>
      <sshPrnamt>32391</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>32391</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>ISHARES TR</nameOfIssuer>
    <titleOfClass>20 YR TR BD ETF</titleOfClass>
    <cusip>464287432</cusip>
    <value>3397</value>
    <shrsOrPrnAmt>
      <sshPrnamt>25630</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>25630</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>CAMECO CORP</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>13321L108</cusip>
    <value>4013</value>
    <shrsOrPrnAmt>
      <sshPrnamt>374039</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>374039</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>ISHARES TR</nameOfIssuer>
    <titleOfClass>NATIONAL MUN ETF</titleOfClass>
    <cusip>464288414</cusip>
    <value>4582</value>
    <shrsOrPrnAmt>
      <sshPrnamt>40600</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>40600</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>UNITED STATES NATL GAS FUND</nameOfIssuer>
    <titleOfClass>UNIT PAR</titleOfClass>
    <cusip>912318300</cusip>
    <value>103</value>
    <shrsOrPrnAmt>
      <sshPrnamt>5200</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>DFND</investmentDiscretion>
    <votingAuthority>
      <Sole>5200</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
</informationTable>
