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Stock Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Dec. 31, 2019
Shares
Outstanding, beginning of period (in shares)	785,832
Granted (in shares)	452,500
Cancelled or forfeited (in shares)	(31,207)
Expired (in shares)	(481)
Outstanding, end of period (in shares)	1,206,644				785,832
Vested and Exercisable (in shares)	366,105
Weighted-Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 16.48
Granted (in dollars per share)	5.32
Cancelled or forfeited (in dollars per share)	27.25
Expired (in dollars per share)	32.10
Outstanding at end of year (in dollars per share)	12.01				$ 16.48
Vested and Exercisable (in dollars per share)	$ 26.33
Weighted Average Remaining Contractual Term (years)
Outstanding	8 years 7 months 24 days				8 years 1 month 17 days
Vested and Exercisable	6 years 11 months 16 days
Aggregate Intrinsic Value
Outstanding					$ 470
Stock options
Stock Incentive Plans
Exercised (in shares)	0		0
Aggregate fair value of options vested		$ 400		$ 500
Weighted average grant date fair value of options granted (in dollars per share)	$ 3.57		$ 3.00
Unrecognized compensation expense related to unvested stock option awards	$ 3,000
Weighted-average amortization period over which cost is expected to be recognized	2 years 10 months 24 days

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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