Basis of Presentation (Details) - USD ($) |
1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 8 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2020 |
Jun. 17, 2020 |
May 13, 2020 |
Mar. 19, 2020 |
Oct. 31, 2019 |
Oct. 29, 2019 |
Jul. 27, 2020 |
Dec. 31, 2019 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Sep. 30, 2019 |
Jul. 27, 2020 |
Jun. 30, 2020 |
Dec. 31, 2019 |
Jun. 30, 2020 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 20, 2018 |
|
| Basis of Presentation [Line Items] | ||||||||||||||||||||
| Accumulated deficit | $ (150,420,000) | $ (150,420,000) | $ (157,953,000) | $ (150,420,000) | $ (150,420,000) | $ (150,420,000) | $ (150,420,000) | |||||||||||||
| Net Cash Used in Operating Activities | (7,070,000) | $ (2,287,000) | ||||||||||||||||||
| Cash | $ 55,112,000 | $ 55,112,000 | $ 77,543,000 | $ 55,112,000 | $ 2,103,000 | $ 55,112,000 | 55,112,000 | 55,112,000 | $ 55,112,000 | $ 4,421,000 | ||||||||||
| Proceeds from exercise of warrants | $ 6,400,000 | $ 6,300,000 | ||||||||||||||||||
| Net proceeds from underwritten public offering | $ 4,500,000 | |||||||||||||||||||
| Gross proceeds from issuance | $ 4,520,000 | |||||||||||||||||||
| Common Stock, Par or Stated Value Per Share | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | |||||||||||||
| Stock Issued During Period, Shares, Warrants Exercised | 29,100,000 | 29,100,000 | 29,100,000 | 14,999,998 | ||||||||||||||||
| Lincoln Park 2020 Purchase Agreement | ||||||||||||||||||||
| Basis of Presentation [Line Items] | ||||||||||||||||||||
| Stock Issued During Period, Value, New Issues | $ 1,100,000 | |||||||||||||||||||
| Shares of the common stock issued | 1,000,000 | 815,827 | 2,673,000 | 16,800,000 | 19,470,000 | |||||||||||||||
| Shares Issued, Price Per Share | $ 1.09 | |||||||||||||||||||
| Number of shares offered | 1,000,000 | |||||||||||||||||||
| Gross proceeds from issuance | $ 6,790,000 | $ 25,230,000 | ||||||||||||||||||
| Common Stock, Par or Stated Value Per Share | $ 0.001 | |||||||||||||||||||
| Authorized value of shares | $ 50,000,000 | |||||||||||||||||||
| Term of agreement | 36 months | |||||||||||||||||||
| Net Proceeds From Issuance Of Common Stock Shares | 30,020,000 | |||||||||||||||||||
| Net Proceeds From Issuance Of Common Stock | $ 68,970,000 | $ 83,600,000 | ||||||||||||||||||
| Common Stock | ||||||||||||||||||||
| Basis of Presentation [Line Items] | ||||||||||||||||||||
| Shares of the common stock issued | 2,450,000 | |||||||||||||||||||
| Shares Issued, Price Per Share | $ 0.20 | $ 0.90 | ||||||||||||||||||
| Common Stock | Lincoln Park 2020 Purchase Agreement | ||||||||||||||||||||
| Basis of Presentation [Line Items] | ||||||||||||||||||||
| Net Proceeds From Issuance Of Common Stock | $ 3,000,000 | |||||||||||||||||||
| UBS Securities, LLC ("UBS") | ||||||||||||||||||||
| Basis of Presentation [Line Items] | ||||||||||||||||||||
| Net proceeds from underwritten public offering | $ 72,000,000 | |||||||||||||||||||
| Shares of the common stock issued | 2,360,000 | 17,420,000 | 10,410,000 | |||||||||||||||||
| Gross proceeds from issuance | $ 5,550,000 | $ 37,840,000 | $ 26,850,000 | |||||||||||||||||