Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands |
Common Stock [Member]
The March 2020 Offering [Member]
Underwriters' Designees [Member]
|
Common Stock [Member]
The March 2020 Offering [Member]
|
Common Stock [Member]
The September 2019 Offering [Member]
Underwriters' Designees [Member]
|
Common Stock [Member]
The September 2019 Offering [Member]
|
Common Stock [Member]
The July 2020 Offering [Member]
|
Common Stock [Member]
The April 2019 Offering [Member]
Underwriters' Designees [Member]
|
Common Stock [Member]
The April 2019 Offering [Member]
|
Common Stock [Member]
The December 2020 Offering [Member]
|
Common Stock [Member]
The October 2020 Offering [Member]
Underwriters' Designees [Member]
|
Common Stock [Member]
Placement Agents' Designees [Member]
|
Common Stock [Member] |
Additional Paid-in Capital [Member]
The March 2020 Offering [Member]
Underwriters' Designees [Member]
|
Additional Paid-in Capital [Member]
The March 2020 Offering [Member]
|
Additional Paid-in Capital [Member]
The September 2019 Offering [Member]
Underwriters' Designees [Member]
|
Additional Paid-in Capital [Member]
The September 2019 Offering [Member]
|
Additional Paid-in Capital [Member]
The July 2020 Offering [Member]
|
Additional Paid-in Capital [Member]
The April 2019 Offering [Member]
Underwriters' Designees [Member]
|
Additional Paid-in Capital [Member]
The April 2019 Offering [Member]
|
Additional Paid-in Capital [Member]
The December 2020 Offering [Member]
|
Additional Paid-in Capital [Member]
The October 2020 Offering [Member]
Underwriters' Designees [Member]
|
Additional Paid-in Capital [Member]
Placement Agents' Designees [Member]
|
Additional Paid-in Capital [Member] |
Retained Earnings [Member]
The March 2020 Offering [Member]
Underwriters' Designees [Member]
|
Retained Earnings [Member]
The March 2020 Offering [Member]
|
Retained Earnings [Member]
The September 2019 Offering [Member]
Underwriters' Designees [Member]
|
Retained Earnings [Member]
The September 2019 Offering [Member]
|
Retained Earnings [Member]
The July 2020 Offering [Member]
|
Retained Earnings [Member]
The April 2019 Offering [Member]
Underwriters' Designees [Member]
|
Retained Earnings [Member]
The April 2019 Offering [Member]
|
Retained Earnings [Member]
The December 2020 Offering [Member]
|
Retained Earnings [Member]
The October 2020 Offering [Member]
Underwriters' Designees [Member]
|
Retained Earnings [Member]
Placement Agents' Designees [Member]
|
Retained Earnings [Member] |
AOCI Attributable to Parent [Member]
The March 2020 Offering [Member]
Underwriters' Designees [Member]
|
AOCI Attributable to Parent [Member]
The March 2020 Offering [Member]
|
AOCI Attributable to Parent [Member]
The July 2020 Offering [Member]
|
AOCI Attributable to Parent [Member]
The December 2020 Offering [Member]
|
AOCI Attributable to Parent [Member]
The October 2020 Offering [Member]
Underwriters' Designees [Member]
|
AOCI Attributable to Parent [Member] |
The March 2020 Offering [Member]
Underwriters' Designees [Member]
|
The March 2020 Offering [Member] |
The September 2019 Offering [Member]
Underwriters' Designees [Member]
|
The September 2019 Offering [Member] |
The July 2020 Offering [Member] |
The April 2019 Offering [Member]
Underwriters' Designees [Member]
|
The April 2019 Offering [Member] |
The December 2020 Offering [Member] |
The October 2020 Offering [Member]
Underwriters' Designees [Member]
|
The October 2020 Offering [Member] |
Placement Agents' Designees [Member] |
Total |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Balances (in shares) at Dec. 31, 2018 | 7,141,189 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Balances at Dec. 31, 2018 | $ 1 | $ 109,226 | $ (98,016) | $ 11,211 | |||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock, net of offering costs (in shares) | 1,200,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock, net of offering costs | $ 0 | 2,440 | 0 | 2,440 | |||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock warrants to placement agents’ designees | $ 0 | $ 0 | $ 0 | $ 333 | $ 497 | $ 100 | $ 0 | $ 0 | $ 0 | $ 333 | $ 497 | $ 100 | |||||||||||||||||||||||||||||||||||||||
Issuance of common stock, pre-funded warrants and common stock warrants, net of offering costs (in shares) | 925,455 | 26,124,828 | |||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock, pre-funded warrants and common stock warrants, net of offering costs | $ 0 | $ 3 | $ 7,741 | $ 7,239 | $ 0 | $ 0 | $ 7,741 | $ 7,242 | |||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of pre-funded warrants (in shares) | 12,265,455 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of pre-funded warrants | $ 1 | 1,225 | 0 | 1,226 | |||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of common stock warrants (in shares) | 598,067 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of common stock warrants | $ 0 | 180 | 0 | 180 | |||||||||||||||||||||||||||||||||||||||||||||||
Stock-based compensation | 0 | 627 | 0 | 627 | |||||||||||||||||||||||||||||||||||||||||||||||
Net loss | $ 0 | 0 | (18,645) | $ (18,645) | |||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of options (in shares) | 0 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Balances (in shares) at Dec. 31, 2019 | 48,254,994 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Balances at Dec. 31, 2019 | $ 5 | 129,608 | (116,661) | $ 0 | $ 12,952 | ||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock, net of offering costs (in shares) | 12,503,806 | 692,651 | |||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock, net of offering costs | $ 1 | $ 0 | $ 97,033 | $ 4,900 | $ 0 | $ 0 | $ 0 | $ 0 | $ 97,034 | $ 4,900 | |||||||||||||||||||||||||||||||||||||||||
Issuance of common stock warrants to placement agents’ designees | $ 0 | $ 453 | $ 0 | $ 0 | $ 453 | ||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock, pre-funded warrants and common stock warrants, net of offering costs (in shares) | 4,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock, pre-funded warrants and common stock warrants, net of offering costs | $ 0 | $ 8,722 | $ 0 | $ 0 | $ 8,722 | ||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of common stock warrants (in shares) | 44,404,966 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of common stock warrants | $ 5 | 25,946 | 0 | 0 | 25,951 | ||||||||||||||||||||||||||||||||||||||||||||||
Stock-based compensation | 0 | 4,358 | 0 | 0 | 4,358 | ||||||||||||||||||||||||||||||||||||||||||||||
Net loss | $ 0 | 0 | (32,220) | 0 | $ (32,220) | ||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of options (in shares) | 414,676 | 414,676 | |||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of options | $ 0 | 602 | 0 | 0 | $ 602 | ||||||||||||||||||||||||||||||||||||||||||||||
Disgorgement of short-swing profits, net of costs | $ 0 | 652 | 0 | 0 | 652 | ||||||||||||||||||||||||||||||||||||||||||||||
Balances (in shares) at Dec. 31, 2020 | 110,271,093 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Balances at Dec. 31, 2020 | $ 11 | 272,274 | (148,881) | 0 | 123,404 | ||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock, net of offering costs (in shares) | 13,239,839 | 13,239,839 | |||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock, net of offering costs | $ 2 | $ 122,208 | $ 0 | $ 0 | $ 122,210 | ||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of pre-funded warrants (in shares) | 1,070,921 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of pre-funded warrants | $ 0 | 1,745 | 0 | 0 | 1,745 | ||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of common stock warrants (in shares) | 1,012,540 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of common stock warrants | $ 0 | 1,849 | 0 | 0 | 1,849 | ||||||||||||||||||||||||||||||||||||||||||||||
Stock-based compensation | 0 | 8,867 | 0 | 0 | 8,867 | ||||||||||||||||||||||||||||||||||||||||||||||
Net loss | 0 | 0 | (70,470) | 0 | $ (70,470) | ||||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock upon exercise of options (in shares) | 1,070,921 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Unrealized losses on available-for-sale investments | $ 0 | 0 | 0 | (74) | $ (74) | ||||||||||||||||||||||||||||||||||||||||||||||
Balances (in shares) at Dec. 31, 2021 | 125,594,393 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Balances at Dec. 31, 2021 | $ 13 | $ 406,943 | $ (219,351) | $ (74) | $ 187,531 |