Commitments - Effect of Adoption ASC 842 (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets under operating leases	$ 2,253	$ 2,533
Total assets	15,382	17,713	$ 15,180
Current portion of operating lease obligations		1,314
Total current liabilities	14,268	15,101	13,831
Long-term portion of operating lease obligations		1,263
Total liabilities	$ 22,411	23,966	$ 21,433
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets under operating leases		2,533
Total assets		2,533
Current portion of operating lease obligations		1,314
Total current liabilities		1,270
Long-term portion of operating lease obligations		1,263
Total liabilities		$ 2,533