XML 64 R53.htm IDEA: XBRL DOCUMENT v3.19.2
Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares canceled (shares) 508,847     886    
Weighted average grant date fair value, grants in period (in dollars per share)   $ 51.94 $ 4.24 $ 43.35 $ 4.06  
Stock based compensation not recognized, options   $ 15,300   $ 15,300   $ 17,500
Stock based compensation not recognized, period for recognition (years)       2 years 4 months 2 days   2 years 8 months 21 days
Number of shares outstanding (in shares)   5,677,472   5,677,472   7,588,405
Number of shares granted (in shares)       55,712    
Stock-based compensation   $ 3,215 $ 1,180 $ 6,397 $ 2,457  
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercises in period, intrinsic value   $ 108,300 $ 478 $ 116,400 $ 1,800  
Shares authorized (in shares)   3,658,602   3,658,602    
Risk-free interest rate   1.90% 3.00%      
Expected dividend yield   0.00% 0.00% 0.00%    
2018 Employee Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock based compensation not recognized, other than options   $ 151   $ 151    
Stock based compensation not recognized, period for recognition (years)       1 month    
Stock-based compensation     $ 440 $ 1,006    
Shares authorized (in shares)   922,250   922,250    
Maximum employee subscription rate, ESPP   10.00%   10.00%    
ESPP purchase price of common stock (as a percent of the fair value of common stock)       85.00%    
Common stock issued under employee stock purchase plan (in shares)   0   119,702    
Weighted-average expected life       5 months 29 days    
Expected volatility       60.20%    
Risk-free interest rate       2.50%    
Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock based compensation not recognized, other than options   $ 7,400   $ 7,400    
Stock based compensation not recognized, period for recognition (years)       3 years 4 months 2 days    
Nonemployee stock option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock subject to repurchase (in shares)       29,513   44,268
Stock subject to repurchase, per share (in dollars per share)   $ 4.66   $ 4.66   $ 4.66
Cash proceeds received for unvested shares   $ 137   $ 137   $ 206