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
 3 Months Ended
Mar. 31, 2020
Dec. 31, 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) 40,700,206 39,817,917
Restricted shares subject to repurchase for unvested shares related to early option exercises under stock equity plans (in shares) 4,689 6,219
Cash exercises for warrants (in shares) 617,296  
Aggregate gross proceeds $ 6,184  
Stock issued, warrants exercised (in shares) 10,913,146  
Warrants outstanding (in shares) 3,836,112 3,836,112
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