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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Sep. 30, 2019   40,367,000      
Beginning Balance at Sep. 30, 2019 $ 107,333 $ 40 $ 132,160 $ (20,806) $ (4,061)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)   301,000      
Exercise of stock options 1,038   1,038    
Settlement of restricted stock units (in shares)   677,000      
Settlement of restricted stock units 0 $ 1 (1)    
Issuance of common stock under employee stock purchase plan (in shares)   75,000      
Issuance of common stock under employee stock purchase plan 606   606    
Stock-based compensation expense 7,112   7,112    
Repurchases and retirements of common stock (in shares)   (137,000)      
Repurchases and retirements of common stock (1,002)     (1,002)  
Components of other comprehensive income:          
Net income 2,816     2,816  
Foreign currency translation adjustment 1,324       1,324
Unrealized holding gain (loss) on available for sale investments 156       156
Other comprehensive income 4,296        
Ending Balance (in shares) at Jun. 30, 2020   41,283,000      
Ending Balance at Jun. 30, 2020 119,383 $ 41 140,915 (18,992) (2,581)
Beginning Balance (in shares) at Mar. 31, 2020   41,076,000      
Beginning Balance at Mar. 31, 2020 113,908 $ 41 138,021 (20,340) (3,814)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)   116,000      
Exercise of stock options 393   393    
Settlement of restricted stock units (in shares)   91,000      
Settlement of restricted stock units 0        
Stock-based compensation expense 2,501   2,501    
Components of other comprehensive income:          
Net income 1,348     1,348  
Foreign currency translation adjustment 1,135       1,135
Unrealized holding gain (loss) on available for sale investments 98       98
Other comprehensive income 2,581        
Ending Balance (in shares) at Jun. 30, 2020   41,283,000      
Ending Balance at Jun. 30, 2020 $ 119,383 $ 41 140,915 (18,992) (2,581)
Beginning Balance (in shares) at Sep. 30, 2020 41,779,853 41,780,000      
Beginning Balance at Sep. 30, 2020 $ 132,243 $ 42 146,518 (13,994) (323)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares) 286,848 287,000      
Exercise of stock options $ 2,198   2,198    
Settlement of restricted stock units (in shares)   1,008,000      
Settlement of restricted stock units 0 $ 1 (1)    
Issuance of common stock under employee stock purchase plan (in shares)   77,000      
Issuance of common stock under employee stock purchase plan 794   794    
Acquisition-related shares issued (in shares)   867,000      
Acquisition-related shares issued 13,943 $ 1 13,942    
Stock-based compensation expense 8,582   8,582    
Sale of convertible senior notes warrants 23,909   23,909    
Repurchases and retirements of common stock 0        
Components of other comprehensive income:          
Net income 6,171     6,171  
Foreign currency translation adjustment 859       859
Unrealized holding gain (loss) on available for sale investments (175)       (175)
Other comprehensive income $ 6,855        
Ending Balance (in shares) at Jun. 30, 2021 44,018,619 44,019,000      
Ending Balance at Jun. 30, 2021 $ 188,524 $ 44 195,942 (7,823) 361
Beginning Balance (in shares) at Mar. 31, 2021   43,052,000      
Beginning Balance at Mar. 31, 2021 167,729 $ 43 178,891 (10,808) (397)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)   27,000      
Exercise of stock options 241   241    
Settlement of restricted stock units (in shares)   73,000      
Settlement of restricted stock units 0        
Acquisition-related shares issued (in shares)   867,000      
Acquisition-related shares issued 13,944 $ 1 13,943    
Stock-based compensation expense 2,867   2,867    
Components of other comprehensive income:          
Net income 2,985     2,985  
Foreign currency translation adjustment 747       747
Unrealized holding gain (loss) on available for sale investments 11       11
Other comprehensive income $ 3,743        
Ending Balance (in shares) at Jun. 30, 2021 44,018,619 44,019,000      
Ending Balance at Jun. 30, 2021 $ 188,524 $ 44 $ 195,942 $ (7,823) $ 361