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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)   185,000      
Exercise of stock options 645   645    
Settlement of restricted stock units (in shares)   586,000      
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 4,611   4,611    
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 (loss):          
Net income 1,468     1,468  
Foreign currency translation adjustment 189       189
Unrealized gain (loss) on investments 58       58
Other comprehensive income (loss) 1,715        
Ending Balance (in shares) at Mar. 31, 2020   41,076,000      
Ending Balance at Mar. 31, 2020 113,908 $ 41 138,021 (20,340) (3,814)
Beginning Balance (in shares) at Dec. 31, 2019   40,865,000      
Beginning Balance at Dec. 31, 2019 111,524 $ 41 134,535 (20,246) (2,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)   161,000      
Exercise of stock options 572   572    
Settlement of restricted stock units (in shares)   112,000      
Settlement of restricted stock units 0        
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 2,308   2,308    
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 (loss):          
Net income 908     908  
Foreign currency translation adjustment (1,064)       (1,064)
Unrealized gain (loss) on investments 56       56
Other comprehensive income (loss) (100)        
Ending Balance (in shares) at Mar. 31, 2020   41,076,000      
Ending Balance at Mar. 31, 2020 $ 113,908 $ 41 138,021 (20,340) (3,814)
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) 259,865 260,000      
Exercise of stock options $ 1,958   1,958    
Settlement of restricted stock units (in shares)   935,000      
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 792   792    
Stock-based compensation expense 5,715   5,715    
Sale of convertible senior notes warrants 23,909   23,909    
Repurchases and retirements of common stock 0        
Components of other comprehensive income (loss):          
Net income 3,186     3,186  
Foreign currency translation adjustment 112       112
Unrealized gain (loss) on investments (186)       (186)
Other comprehensive income (loss) $ 3,112        
Ending Balance (in shares) at Mar. 31, 2021 43,052,478 43,052,000      
Ending Balance at Mar. 31, 2021 $ 167,729 $ 43 178,891 (10,808) (397)
Beginning Balance (in shares) at Dec. 31, 2020   42,668,000      
Beginning Balance at Dec. 31, 2020 141,753 $ 43 151,153 (11,827) 2,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options (in shares)   18,000      
Exercise of stock options 69   69    
Settlement of restricted stock units (in shares)   289,000      
Settlement of restricted stock units (1)   (1)    
Issuance of common stock under employee stock purchase plan (in shares)   77,000      
Issuance of common stock under employee stock purchase plan 793   793    
Stock-based compensation expense 2,968   2,968    
Sale of convertible senior notes warrants 23,909   23,909    
Components of other comprehensive income (loss):          
Net income 1,019     1,019  
Foreign currency translation adjustment (2,648)       (2,648)
Unrealized gain (loss) on investments (133)       (133)
Other comprehensive income (loss) $ (1,762)        
Ending Balance (in shares) at Mar. 31, 2021 43,052,478 43,052,000      
Ending Balance at Mar. 31, 2021 $ 167,729 $ 43 $ 178,891 $ (10,808) $ (397)