Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

v3.19.2
Stockholders' Equity (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
stockholder
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2012
$ / shares
shares
Subsidiary, Sale of Stock [Line Items]        
Common stock, shares authorized (in shares) 1,000,000,000      
Common stock, par value | $ / shares $ 0.0001 $ 0.0001    
Common stock, shares outstanding (in shares) 38,927,776 27,294,164    
Restricted shares subject to repurchase for unvested shares related to early option exercises under stock equity plans (in shares) 25,230 40,707    
Issuance of common stock shares (in shares)   1,085,096    
Issuance of common stock, net of issuance costs | $   $ 9,565,000    
Cash exercises for warrants (in shares) 617,296      
Aggregate gross proceeds | $ $ 6,184,000      
Stock issued, warrants exercised (in shares) 10,913,146      
Exercise price per share (in dollars per share) | $ / shares $ 11.5      
Warrants outstanding (in shares) 3,836,112 18,312,595    
Cash        
Subsidiary, Sale of Stock [Line Items]        
Aggregate gross proceeds | $ $ 6,092,000      
Digital Currencies        
Subsidiary, Sale of Stock [Line Items]        
Aggregate gross proceeds | $ $ 92,000      
Warrant        
Subsidiary, Sale of Stock [Line Items]        
Stock issued, warrants exercised (in shares) 2,951,741      
Warrant to purchase aggregate shares of common stock (in shares)   1,085,059   14,866
Exercise price per share (in dollars per share) | $ / shares   $ 9.22   $ 5.54
Public warrants exercisable for cash, number of days following reverse merger and recapitalization   30 days    
Effective registration statement not on file, number of days following reverse merger and recapitalization   90 days    
Warrants exercised via cashless provisions (in shares) 5,139,319      
PhunCoin Warrant        
Subsidiary, Sale of Stock [Line Items]        
PhunCoin warrants | $   $ 0    
Exercise price per share (in dollars per share) | $ / shares   $ 11.5    
Warrants outstanding (in shares)   27,400,000,000    
Number of stockholders | stockholder   68    
Warrants issued to Phunware shareholders (in shares)   0    
Private Placement | Warrant        
Subsidiary, Sale of Stock [Line Items]        
Exercise price per share (in dollars per share) | $ / shares   $ 11.5    
Public warrants exercisable for cash, number of days following reverse merger and recapitalization   30 days    
Employee Stock Option        
Subsidiary, Sale of Stock [Line Items]        
Aggregate shares issued (in shares)     130,000  
Exercise price per share (in dollars per share) | $ / shares     $ 11.5  
Warrants outstanding (in shares) 24,172      
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