Quarterly report pursuant to Section 13 or 15(d)

Nature of Business and Summary of Significant Accounting Policies, Restricted Cash (Details)

v3.19.3
Nature of Business and Summary of Significant Accounting Policies, Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents and Restricted Cash [Abstract]        
Cash and cash equivalents $ 5,019 $ 3,946    
Restricted cash 6,243 0    
Total cash and cash equivalents and restricted cash $ 11,262 $ 3,946 $ 113 $ 157