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Equity Transactions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for issuance (in shares) 16,300,000    
Reserve shares counted per share granted from fungible share pool (in shares) 1.5    
Remaining shares reserved for issuance (in shares) 1,321,256    
Stock compensation awards, total liability $ 758 $ 749  
Stock compensation awards, current portion $ 707 $ 557  
Weighted average grant date fair value of options granted (in dollars per share) $ 2.70 $ 2.04 $ 3.58
Intrinsic value of options exercised $ 307 $ 30 $ 24
Shares repurchased (in shares) 0    
Remaining repurchase amount $ 10,100    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options not yet exercisable (in shares) 1,402,114    
Options, service-based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options not yet exercisable (in shares) 618,488    
Unrecognized compensation cost $ 1,400    
Weighted average vesting period for unrecognized compensation cost 2 years 10 months 24 days    
Options, service-based | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Stock options, expiration term 5 years    
Options, service-based | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Stock options, expiration term 10 years    
Options, service and performance or market based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options not yet exercisable (in shares) 783,626    
Restricted stock units and restricted stock awards, service based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested shares (in shares) 748,670    
Restricted stock units and restricted stock awards, service and performance or market based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested shares (in shares) 1,175,310    
Restricted stock unit, service based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average vesting period for unrecognized compensation cost 2 years 6 months    
Unrecognized compensation cost, excluding options $ 2,900    
Restricted stock unit, service based | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Restricted stock unit, service based | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Stock appreciation rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested shares (in shares) 290,207    
Cash paid to settle stock appreciation rights $ 500 $ 200 $ 300
Stock appreciation rights, weighted-average fair value (in dollars per share) $ 1.7 $ 0.8  
Stock appreciation rights, service based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average vesting period for unrecognized compensation cost 3 years 2 months 12 days    
Nonvested shares (in shares) 164,088    
Unrecognized compensation cost, excluding options $ 100    
Stock appreciation rights, service and performance or market based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested shares (in shares) 126,119    
Stock options, RSUs and RSAs, performance based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average vesting period for unrecognized compensation cost 2 years 2 months 12 days    
Unrecognized compensation costs $ 600    
Stock options, RSUs and SARS, market based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Unrecognized compensation cost $ 1,200    
Weighted average vesting period for unrecognized compensation cost 1 year 8 months 12 days    
Average share price term 20 days