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Statements of Cash Flows (Tables)
6 Months Ended
Jun. 30, 2020
Statements of Cash Flows.  
Schedule of reconciliation of cash and cash equivalents and restricted cash presented on the condensed balance sheets to the same amounts presented on the condensed statements of cash flows

    

June 30, 

June 30, 

December 31, 

December 31, 

    

2020

    

2019

    

2019

    

2018

Cash and cash equivalents

$

298,489

$

274,344

$

166,130

$

36,973

Restricted cash

 

 

928

 

928

 

Total cash and cash equivalents and restricted cash shown on the condensed statements of cash flows

$

298,489

$

275,272

$

167,058

$

36,973