Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended					9 Months Ended		17 Months Ended
	Mar. 27, 2020	Mar. 25, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 25, 2020
Class Of Stock [Line Items]
Net proceeds from sale of common stock	$ 2,900	$ 1,600						$ 5,650	$ 3,919
Common stock, par value	$ 3.75	$ 5.00								$ 5.00
Common Stock
Class Of Stock [Line Items]
Shares agreed to sell upon agreement			1,227,000	433,000	146,000	206,000	1,277,000
Common Stock | Market Issuance Sales Agreement
Class Of Stock [Line Items]
Shares agreed to sell upon agreement										793,668
Net proceeds from sale of common stock										$ 2,300
Average sale price per share										$ 3.04
Additional common stock shares sold		0
Common Stock | Securities Purchase Agreement
Class Of Stock [Line Items]
Shares agreed to sell upon agreement	873,335	354,000
Common stock offering price per share	$ 3.75	$ 5.00								5.00
Common stock, par value		$ 0.001								$ 0.001
Gross proceeds before deducting agent’s fees and offering expenses	$ 3,275	$ 1,770
Warrants | Securities Purchase Agreement
Class Of Stock [Line Items]
Warrants issued	61,133	24,780								24,780
Percentage of shares sold in offering	7.00%	7.00%
Exercise price of warrants	$ 4.6875	$ 6.25								$ 6.25
Percentage of per share offering price of shares	125.00%	125.00%
Warrants maturity date	Mar. 27, 2025	Mar. 25, 2025								Mar. 25, 2025