XML 59 R47.htm IDEA: XBRL DOCUMENT v3.8.0.1
Subsequent Events (Details)
$ / shares in Units, $ in Millions
May 10, 2018
USD ($)
Apr. 30, 2018
USD ($)
$ / shares
shares
Apr. 13, 2018
Apr. 24, 2018
shares
Mar. 31, 2018
shares
Dec. 31, 2017
shares
2001 Plan            
Subsequent Event [Line Items]            
Number of shares authorized for issuance         9,000,000 9,000,000
Subsequent Event            
Subsequent Event [Line Items]            
Reverse stock split ratio     0.2      
Shares of common stock issued upon conversion (in shares)   24,600,000        
Lease renewal option term of contract 5 years          
Total lease extension commitments | $ $ 1.9          
Subsequent Event | 2001 Plan            
Subsequent Event [Line Items]            
Number of shares available for issuance (in shares)       0    
Subsequent Event | 2018 Plan            
Subsequent Event [Line Items]            
Number of shares authorized for issuance       3,400,000    
Maximum number of shares to be added to Plan       5,600,000    
Number of shares that can be added upon annual increase       3,400,000    
Percentage of shares of common stock on last day of fiscal year that can be added upon annual increase       5.00%    
Subsequent Event | 2018 ESPP            
Subsequent Event [Line Items]            
Number of shares authorized for issuance       900,000    
Number of shares that can be added upon annual increase       900,000    
Percentage of shares of common stock on last day of fiscal year that can be added upon annual increase       2.00%    
Subsequent Event | IPO            
Subsequent Event [Line Items]            
Number of shares issued   6,900,000        
Initial price per share in IPO (in USD per share) | $ / shares   $ 16        
Net proceeds received from IPO | $   $ 100.3        
Subsequent Event | IPO - Over-Allotment Option            
Subsequent Event [Line Items]            
Number of shares issued   900,000