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Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Oct. 01, 2018
Increase (Decrease) in Stockholders' Equity              
Balance $ 112,437 $ 116,175 $ 126,499 $ 129,654 $ 116,175 $ 129,654  
Cumulative adjustment related to the adoption of ASC 606             $ 730
Net loss (4,238) (5,196) (4,362) (5,022) (9,434) (9,384)  
Exercise of stock options, grants of restricted stock awards, and vesting of restricted stock units             32 2 116 8      
Stock compensation expense     2,011 1,556      
Foreign currency translation     201 (427)      
Forfeitures of restricted stock awards   0 0        
Balance $ 108,112 $ 112,437 $ 124,465 $ 126,499 $ 108,112 $ 124,465  
Common Stock              
Increase (Decrease) in Stockholders' Equity              
Balance (in shares) 33,887,591 33,687,115 33,183,178 32,774,118 33,687,115 32,774,118  
Balance $ 34 $ 34 $ 33 $ 33 $ 34 $ 33  
Exercise of stock options, grants of restricted stock awards, and vesting of restricted stock units (in shares) 111,272 283,164 197,642 409,060      
Forfeitures of restricted stock awards (in shares)     (33,163)        
Balance (in shares) 33,988,798 33,887,591 33,347,657 33,183,178 33,988,798 33,347,657  
Balance $ 34 $ 34 $ 33 $ 33 $ 34 $ 33  
Additional Paid-in Capital              
Increase (Decrease) in Stockholders' Equity              
Balance 243,311 242,686 237,679 236,115 242,686 236,115  
Exercise of stock options, grants of restricted stock awards, and vesting of restricted stock units             32 2 116 8      
Stock compensation expense     2,011 1,556      
Balance 244,527 243,311 239,806 237,679 244,527 239,806  
Accumulated Other Comprehensive Loss              
Increase (Decrease) in Stockholders' Equity              
Balance (7,140) (7,973) (6,876) (6,449) (7,973) (6,449)  
Foreign currency translation     198 (427)      
Balance (8,443) (7,140) (6,678) (6,876) (8,443) (6,678)  
Accumulated Deficit              
Increase (Decrease) in Stockholders' Equity              
Balance (123,768) (118,572) (104,337) (100,045) (118,572) (100,045)  
Cumulative adjustment related to the adoption of ASC 606             $ 730
Net loss (4,238) (5,196) (4,362) (5,022)      
Foreign currency translation     3 0      
Balance $ (128,006) $ (123,768) $ (108,696) $ (104,337) $ (128,006) $ (108,696)