CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Series B Preferred Stock | At-the-market Issuance | Registered Direct Offering | Preferred Stock Series A Preferred Stock | Preferred Stock Series B Preferred Stock | Common Stock | Common Stock Series A Preferred Stock | Common Stock At-the-market Issuance | Common Stock Registered Direct Offering | Treasury Stock | Additional Paid-in Capital | Additional Paid-in Capital Series B Preferred Stock | Additional Paid-in Capital At-the-market Issuance | Additional Paid-in Capital Registered Direct Offering | Accumulated Other Comprehensive Income | Accumulated Deficit |
Beginning balance (in shares) at Dec. 31, 2020 | | | | | 7 | 0 | 184,133,384 | | | | | | | | | | |
Beginning balance at Dec. 31, 2020 | $ 21,550 | | | | $ 0 | $ 0 | $ 1,841 | | | | $ (48) | $ 93,059 | | | | $ 0 | $ (73,302) |
Increase (Decrease) in Stockholders' Equity | | | | | | | | | | | | | | | | | |
Stock-based compensation expense | 833 | | | | | | | | | | | 833 | | | | | |
Issuance of common stock for option exercises (in shares) | | | | | | | 157,468 | | | | | | | | | | |
Issuance of common stock for stock option exercises | 176 | | | | | | $ 2 | | | | | 174 | | | | | |
Issuance of stock (in shares) | | | | | | 54,745 | | | 987,000 | 3,000,000 | | | | | | | |
Issuance of stock | | $ 4,954 | $ 4,849 | $ 21,204 | | $ 1 | | | $ 10 | $ 30 | | | $ 4,953 | $ 4,839 | $ 21,174 | | |
Net loss | (7,077) | | | | | | | | | | | | | | | | (7,077) |
Ending balance (in shares) at Mar. 31, 2021 | | | | | 7 | 54,745 | 188,277,852 | | | | | | | | | | |
Ending balance at Mar. 31, 2021 | 46,489 | | | | $ 0 | $ 1 | $ 1,883 | | | | (48) | 125,032 | | | | 0 | (80,379) |
Beginning balance (in shares) at Dec. 31, 2020 | | | | | 7 | 0 | 184,133,384 | | | | | | | | | | |
Beginning balance at Dec. 31, 2020 | 21,550 | | | | $ 0 | $ 0 | $ 1,841 | | | | (48) | 93,059 | | | | 0 | (73,302) |
Increase (Decrease) in Stockholders' Equity | | | | | | | | | | | | | | | | | |
Foreign currency translation adjustment | 0 | | | | | | | | | | | | | | | | |
Net loss | (43,784) | | | | | | | | | | | | | | | | |
Ending balance (in shares) at Sep. 30, 2021 | | | | | 7 | 54,745 | 199,049,329 | | | | | | | | | | |
Ending balance at Sep. 30, 2021 | 107,110 | | | | $ 0 | $ 1 | $ 1,990 | | | | (48) | 222,253 | | | | 0 | (117,086) |
Beginning balance (in shares) at Mar. 31, 2021 | | | | | 7 | 54,745 | 188,277,852 | | | | | | | | | | |
Beginning balance at Mar. 31, 2021 | 46,489 | | | | $ 0 | $ 1 | $ 1,883 | | | | (48) | 125,032 | | | | 0 | (80,379) |
Increase (Decrease) in Stockholders' Equity | | | | | | | | | | | | | | | | | |
Stock-based compensation expense | 2,095 | | | | | | | | | | | 2,095 | | | | | |
Issuance of stock (in shares) | | | | | | | | | | 10,000,000 | | | | | | | |
Issuance of stock | | | | $ 93,406 | | | | | | $ 100 | | | | | $ 93,306 | | |
Issuance of common stock for stock option and warrant exercises (in shares) | | | | | | | 538,893 | | | | | | | | | | |
Issuance of common stock for stock option and warrant exercises | 371 | | | | | | $ 5 | | | | | 366 | | | | | |
Net loss | (25,952) | | | | | | | | | | | | | | | | (25,952) |
Ending balance (in shares) at Jun. 30, 2021 | | | | | 7 | 54,745 | 198,816,745 | | | | | | | | | | |
Ending balance at Jun. 30, 2021 | 116,409 | | | | $ 0 | $ 1 | $ 1,988 | | | | (48) | 220,799 | | | | 0 | (106,331) |
Increase (Decrease) in Stockholders' Equity | | | | | | | | | | | | | | | | | |
Stock-based compensation expense | 1,347 | | | | | | | | | | | 1,347 | | | | | |
Issuance of common stock for option exercises (in shares) | | | | | | | 232,584 | | | | | | | | | | |
Issuance of common stock for stock option exercises | 109 | | | | | | $ 2 | | | | | 107 | | | | | |
Foreign currency translation adjustment | 0 | | | | | | | | | | | | | | | | |
Net loss | (10,755) | | | | | | | | | | | | | | | | (10,755) |
Ending balance (in shares) at Sep. 30, 2021 | | | | | 7 | 54,745 | 199,049,329 | | | | | | | | | | |
Ending balance at Sep. 30, 2021 | 107,110 | | | | $ 0 | $ 1 | $ 1,990 | | | | (48) | 222,253 | | | | 0 | (117,086) |
Beginning balance (in shares) at Dec. 31, 2021 | | | | | 7 | 54,745 | 199,502,183 | | | | | | | | | | |
Beginning balance at Dec. 31, 2021 | 95,818 | | | | $ 0 | $ 1 | $ 1,995 | | | | (48) | 225,537 | | | | 0 | (131,667) |
Increase (Decrease) in Stockholders' Equity | | | | | | | | | | | | | | | | | |
Stock-based compensation expense | 3,299 | | | | | | | | | | | 3,299 | | | | | |
Issuance of common stock for option exercises (in shares) | | | | | | | 277,323 | | | | | | | | | | |
Issuance of common stock for stock option exercises | 180 | | | | | | $ 3 | | | | | 177 | | | | | |
Issuance of stock (in shares) | | | | | | | 15,973,420 | | | | | | | | | | |
Issuance of stock | 49,851 | | | | | | $ 160 | | | | | 49,691 | | | | | |
Net loss | (18,019) | | | | | | | | | | | | | | | | (18,019) |
Ending balance (in shares) at Mar. 31, 2022 | | | | | 7 | 54,745 | 215,752,926 | | | | | | | | | | |
Ending balance at Mar. 31, 2022 | 131,129 | | | | $ 0 | $ 1 | $ 2,158 | | | | (48) | 278,704 | | | | 0 | (149,686) |
Beginning balance (in shares) at Dec. 31, 2021 | | | | | 7 | 54,745 | 199,502,183 | | | | | | | | | | |
Beginning balance at Dec. 31, 2021 | $ 95,818 | | | | $ 0 | $ 1 | $ 1,995 | | | | (48) | 225,537 | | | | 0 | (131,667) |
Increase (Decrease) in Stockholders' Equity | | | | | | | | | | | | | | | | | |
Issuance of common stock for option exercises (in shares) | 1,295,999 | | | | | | | | | | | | | | | | |
Foreign currency translation adjustment | $ 30 | | | | | | | | | | | | | | | | |
Net loss | (59,412) | | | | | | | | | | | | | | | | |
Ending balance (in shares) at Sep. 30, 2022 | | | | | 0 | 54,745 | 216,809,937 | | | | | | | | | | |
Ending balance at Sep. 30, 2022 | 95,303 | | | | $ 0 | $ 1 | $ 2,168 | | | | (48) | 284,231 | | | | 30 | (191,079) |
Beginning balance (in shares) at Mar. 31, 2022 | | | | | 7 | 54,745 | 215,752,926 | | | | | | | | | | |
Beginning balance at Mar. 31, 2022 | 131,129 | | | | $ 0 | $ 1 | $ 2,158 | | | | (48) | 278,704 | | | | 0 | (149,686) |
Increase (Decrease) in Stockholders' Equity | | | | | | | | | | | | | | | | | |
Stock-based compensation expense | 2,079 | | | | | | | | | | | 2,079 | | | | | |
Issuance of common stock for option exercises (in shares) | | | | | | | 488,843 | | | | | | | | | | |
Issuance of common stock for stock option exercises | 409 | | | | | | $ 5 | | | | | 404 | | | | | |
Issuance of common stock upon restricted stock unit vesting, net (in shares) | | | | | | | 26,378 | | | | | | | | | | |
Issuance of common stock upon restricted stock unit vesting, net | (48) | | | | | | | | | | | (48) | | | | | |
Series A convertible preferred stock conversion (in shares) | | | | | (7) | | | 3,115 | | | | | | | | | |
Foreign currency translation adjustment | 10 | | | | | | | | | | | | | | | 10 | |
Net loss | (19,471) | | | | | | | | | | | | | | | | (19,471) |
Ending balance (in shares) at Jun. 30, 2022 | | | | | 0 | 54,745 | 216,271,262 | | | | | | | | | | |
Ending balance at Jun. 30, 2022 | 114,108 | | | | $ 0 | $ 1 | $ 2,163 | | | | (48) | 281,139 | | | | 10 | (169,157) |
Increase (Decrease) in Stockholders' Equity | | | | | | | | | | | | | | | | | |
Stock-based compensation expense | 2,495 | | | | | | | | | | | 2,495 | | | | | |
Issuance of common stock for option exercises (in shares) | | | | | | | 529,833 | | | | | | | | | | |
Issuance of common stock for stock option exercises | 612 | | | | | | $ 5 | | | | | 607 | | | | | |
Issuance of common stock upon restricted stock unit vesting, net (in shares) | | | | | | | 8,842 | | | | | | | | | | |
Issuance of common stock upon restricted stock unit vesting, net | (10) | | | | | | | | | | | (10) | | | | | |
Foreign currency translation adjustment | 20 | | | | | | | | | | | | | | | 20 | |
Net loss | (21,922) | | | | | | | | | | | | | | | | (21,922) |
Ending balance (in shares) at Sep. 30, 2022 | | | | | 0 | 54,745 | 216,809,937 | | | | | | | | | | |
Ending balance at Sep. 30, 2022 | $ 95,303 | | | | $ 0 | $ 1 | $ 2,168 | | | | $ (48) | $ 284,231 | | | | $ 30 | $ (191,079) |