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Commitments and Contingencies - Capital Leases (Details)
$ in Thousands
3 Months Ended
Dec. 31, 2016
USD ($)
lease
Capital Leases  
Number of capital leases | lease 4
Future minimum payment commitments, capital leases, principal  
2017 $ 362
2018 384
2019 376
Total capital lease commitments, principal 1,122
Future minimum payment commitments, capital leases, interest  
2017 115
2018 69
2019 21
Total capital lease commitments, interest 205
Future minimum payment commitments, capital leases  
2017 477
2018 453
2019 397
Total capital lease commitments 1,327
Computer hardware  
Capital Leases  
Capital assets acquired 1,141
Capital lease. remaining principal balance $ 1,122
Capital lease, term 3 years