Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Subsidiary, Sale of Stock [Line Items]      
Common stock, shares authorized (in shares)   1,000,000,000  
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001  
Common stock, shares outstanding (in shares) 39,817,917 43,562,804  
Restricted shares subject to repurchase for unvested shares related to early option exercises under stock equity plans (in shares) 6,219 1,485 25,230
Cash exercises for warrants (in shares) 617,296    
Aggregate gross proceeds $ 6,184    
Stock issued, warrants exercised (in shares) 10,913,146    
Cash      
Subsidiary, Sale of Stock [Line Items]      
Aggregate gross proceeds $ 6,092    
Digital Currencies      
Subsidiary, Sale of Stock [Line Items]      
Aggregate gross proceeds $ 92    
Cash and Cashless Exercises      
Subsidiary, Sale of Stock [Line Items]      
Aggregate shares issued (in shares) 11,530,442    
Cashless Exercises      
Subsidiary, Sale of Stock [Line Items]      
Warrants exercised (in shares) 13,975,359