Stockholders' Equity - Transactions with Oasis Capital and Underwritten Public Offering (Details)						1 Months Ended		2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended	14 Months Ended
	Feb. 02, 2022 USD ($)	Dec. 10, 2021 shares	Apr. 29, 2021 USD ($) $ / shares shares	Jan. 13, 2021 USD ($) $ / shares shares	Oct. 05, 2020 USD ($) shares	Apr. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($) D $ / shares shares	Feb. 28, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) shares	Feb. 28, 2021 shares	Aug. 19, 2022 shares	Aug. 18, 2022 $ / shares	Mar. 31, 2022 USD ($)	Feb. 17, 2022 $ / shares	Apr. 07, 2021 $ / shares shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Apr. 15, 2020 USD ($)	Mar. 24, 2020 USD ($)	Jul. 31, 2019 $ / shares	Aug. 28, 2018 shares
Stockholders' equity									$ 2,757,000	$ 31,785,000	$ 2,757,000	$ 31,785,000	$ 11,853,000				$ 8,109,000			$ 31,891,000	$ 17,202,000
Number of securities issued on conversion | shares																									9,580
Common stock, shares issued | shares															32,746,090
Proceeds from exercise of warrants												1,776,000
Share Price | $ / shares																$ 1.00
Maximum
Share Price | $ / shares																		$ 1.00
Minimum
Share Price | $ / shares																		$ 1.00
Registered Direct Offering
Number of shares offered | shares			2,549,000
Gross proceeds from the issuance of common stock			$ 10,800,000
Share Price | $ / shares			$ 4.23
Issuance costs			$ 948,000
At The Market Offering
Amount of shares issued									2,454,000		11,564,000	5,365,000
Issuance costs					$ 40,000				$ 17,000		100,000	311,000
October 2020 ATM Agreement
Issuance of common stock (In shares) | shares					1,271,639									669,850
Issuance costs								$ 311,000
Sale of worth of shares					$ 1,300,000			$ 5,400,000
December 2021 ATM Agreement
Gross proceeds from issuance											$ 11,600,000		$ 3,200,000
Issuance of common stock (In shares) | shares											26,814,743		2,261,596
Issuance costs											$ 100,000
December 2021 ATM Agreement | Maximum
Number of shares offered | shares		15,000,000.0
Amount of shares issued	$ 75,000,000.0
December 2021 ATM Agreement | Minimum
Amount of shares issued	$ 15,000,000.0
Series 1 warrants
Exercise price (in dollars per share) | $ / shares																								$ 6.00
Proceeds from issuance of warrants											$ 682,000
Series 2 warrants
Exercise price (in dollars per share) | $ / shares																								$ 6.00
Proceeds from issuance of warrants										$ 700,000		$ 700,000
Securities Purchase Agreement | Registered Direct Offering
Issuance of common stock (In shares) | shares				1,479,290
Share Price | $ / shares				$ 10.14
Net proceeds				$ 1,600,000
Proceeds from issuance of warrants				$ 15,000,000.0
Equity Line of Credit
Gross proceeds from issuance						$ 22,627
Number of securities issued on conversion | shares																			33,333
Exercise price (in dollars per share) | $ / shares																			$ 5.61
Amount of shares issued							$ 200,000
Term of equity purchase agreement							36 months
Shares issued in settlement of commitment fee | shares						22,935
Fair value of equity issued						$ 33,027
Equity Line of Credit | Maximum
Price per share | $ / shares																			9.00
Par value (per share) | $ / shares																			10.35
Aggregate amount of put option on any put date or clearing date							$ 500,000
Aggregate amount of equity purchase agreement							$ 2,000,000.0
Equity Line of Credit | Minimum
Price per share | $ / shares																			1.31
Par value (per share) | $ / shares																			$ 1.50
Option 1 Put | Equity Line of Credit
Issuance of common stock (In shares) | shares						17,333	66,666
Percentage of average trading volume							20.00%
Trading days | D							10
Share Price | $ / shares							$ 1.31
Option 2 Puts | Equity Line of Credit
Percentage of average trading volume							10.00%
Share Price | $ / shares							$ 1.31
Option 1 and Option 2 Puts | Equity Line of Credit
Stockholders' equity																						$ 0
Derivative Asset, Noncurrent																							$ 0