Equity Financing - Additional Information (Detail) | 1 Months Ended | 6 Months Ended | |
Jan. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jan. 28, 2021 |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Offering costs allocated to common stock warrant liability and expensed | $ | | | | | | | $ 27,000 | $ 769,000 | |
Registration statement expiration term | | | | | | | On May 11, 2018, the Company filed a shelf Registration Statement on Form S-3 with the SEC which was declared effective on June 8, 2018 (“Shelf Registration Statement”). This shelf registration process allows the Company to sell any combination of common stock, preferred stock, warrants and units consisting of such securities in one or more offerings from time to time having aggregate offering prices of up to $50 million. This registration statement may no longer be used after June 8, 2021, the three-year anniversary of its effective date. | | |
Maximum [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Proceeds from issuance, aggregate offering prices | $ | | | | | | | $ 50,000,000 | | |
March 2018 Purchase Agreement [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Shares of common stock issued | | | | | | 1,201,634 | | | |
Warrant issued, shares of common stock called by warrant | | | | | | 1,282,832 | | | |
Warrants issued, exercise price | $ / shares | | | | | | $ 10.7258 | | | |
December 2020 Purchase Agreement [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Shares of common stock issued | | 2,618,658 | | | | | | | |
Proceeds from issuance of common stock and warrants gross | $ | | $ 8,000,000 | | | | | | | |
Offering closing period | | Dec. 22, 2020 | | | | | | | |
December 2020 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | 2,618,658 | | | | | | | |
Warrants issued, exercise price | $ / shares | | $ 3 | | | | | | | |
Warrants expiration period | | 5 years 6 months | | | | | | | |
September 2019 Purchase Agreement [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Shares of common stock issued | | | 1,318,828 | | | | | | |
Proceeds from issuance of common stock and warrants gross | $ | | | $ 10,000,000 | | | | | | |
Offering closing period | | | Sep. 05, 2019 | | | | | | |
September 2019 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | 659,414 | | | | | | |
Warrants issued, exercise price | $ / shares | | | $ 7.52 | | | | | | |
Warrants expiration period | | | 5 years 6 months | | | | | | |
June 2019 Purchase Agreement [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Shares of common stock issued | | | | 1,489,575 | | | | | |
Proceeds from issuance of common stock and warrants gross | $ | | | | $ 7,500,000 | | | | | |
Offering closing period | | | | Jun. 14, 2019 | | | | | |
June 2019 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | 1,489,575 | | | | | |
Warrants issued, exercise price | $ / shares | | | | $ 5 | | | | | |
Warrants expiration period | | | | 5 years 6 months | | | | | |
June 2018 Purchase Agreement [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Shares of common stock issued | | | | | 1,392,345 | | | | |
Proceeds from issuance of common stock and warrants gross | $ | | | | | $ 14,000,000 | | | | |
Offering closing period | | | | | Jun. 14, 2018 | | | | |
June 2018 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | 1,392,345 | | | | |
Warrants issued, exercise price | $ / shares | | | | | $ 9.94 | | | | |
Warrants expiration period | | | | | 5 years 6 months | | | | |
June 2018 Placement Agent Warrants [Member] | June 2018 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | 69,617 | | | | |
Warrants issued, exercise price | $ / shares | | | | | $ 12.568 | | | | |
Warrant, exercisable term | | | | | 5 years | | | | |
June 2019 Placement Agent Warrants [Member] | June 2019 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | 74,479 | | | | | |
Warrants issued, exercise price | $ / shares | | | | $ 6.2938 | | | | | |
Warrant, exercisable term | | | | 5 years | | | | | |
September 2019 Placement Agent Warrants [Member] | September 2019 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | 65,942 | | | | | | |
Warrants issued, exercise price | $ / shares | | | $ 9.4781 | | | | | | |
Warrant, exercisable term | | | 5 years | | | | | | |
December 2020 Placement Agent Warrants [Member] | December 2020 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | 130,933 | | | | | | | |
Warrants issued, exercise price | $ / shares | | $ 3.8188 | | | | | | | |
Warrant, exercisable term | | 5 years | | | | | | | |
March 2018 Private Placement [Member] | March 2018 Purchase Agreement [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Shares of common stock issued | | | | | | 300,752 | | | |
Warrant issued, shares of common stock called by warrant | | | | | | 300,752 | | | |
Warrants issued, exercise price | $ / shares | | | | | | $ 45.75 | | | |
Proceeds from issuance of common stock and warrants gross | $ | | | | | | $ 10,000,000 | | | |
Warrants expiration period | | | | | | 5 years | | | |
March 2018 Private Placement [Member] | March 2018 Placement Agent Warrants [Member] | March 2018 Purchase Agreement [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | 15,038 | | | |
Warrants issued, exercise price | $ / shares | | | | | | $ 41.5625 | | | |
Warrant, exercisable term | | | | | | 5 years | | | |
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Shares of common stock issued | 7,876,784 | | | | | | | | |
Warrant issued, shares of common stock called by warrant | 3,938,392 | | | | | | | | |
Warrants issued, exercise price | $ / shares | $ 3.13 | | | | | | | | |
Proceeds from issuance of common stock and warrants gross | $ | $ 25,100,000 | | | | | | | | |
Warrants expiration period | 5 years 6 months | | | | | | | | |
Remaining offering costs allocated to common stock and offset to additional paid in capital | $ | $ 2,000,000 | | | | | | | | |
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Offering costs allocated to common stock warrant liability and expensed | $ | $ 769,000 | | | | | | | | |
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] | Expected Volatility [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrants and rights outstanding, measurement input | | | | | | | | | 123.8 |
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] | Stock Price [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrants and rights outstanding, measurement input | | | | | | | | | 2.88 |
January 2021 Private Placement [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] | Risk-Free Interest Rate [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrants and rights outstanding, measurement input | | | | | | | | | 0.5 |
January 2021 Private Placement [Member] | January 2021 Placement Agent Warrants [Member] | January 2021 Purchase Agreement [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | 393,839 | | | | | | | | |
Warrants issued, exercise price | $ / shares | $ 3.99 | | | | | | | | |
Warrant, exercisable term | 5 years 6 months | | | | | | | | |
Issuance of placement agent warrants | $ | $ 942,000 | | | | | | | | |
Offering costs | $ | 1,900,000 | | | | | | | | |
January 2021 Private Placement [Member] | January 2021 Placement Agent Warrants [Member] | January 2021 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | |
Class Of Warrant Or Right [Line Items] | | | | | | | | | |
Offering costs | $ | $ 2,800,000 | | | | | | | | |