XML 53 R42.htm IDEA: XBRL DOCUMENT v3.20.2
Balance Sheet Components - At the Market Offering (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 4 Months Ended 9 Months Ended
Jun. 05, 2020
Sep. 30, 2020
Sep. 30, 2020
Class of Stock [Line Items]      
Net proceeds from "at the market" equity offering     $ 3,641
At the Market Offering | Common Stock      
Class of Stock [Line Items]      
Common stock, par value (USD per share) $ 0.001    
Maximum aggregate offering price $ 25,000    
Commission fee (as a percent) 3.00%    
Stock issued in transaction (shares)   1,374,517  
Net proceeds from "at the market" equity offering   $ 3,641  
Gross proceeds from sale of stock   4,071  
Commissions and fees   172  
Other expenses   258  
Remaining availability under the at the market offering   $ 20,929