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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Other Comprehensive Gain/(Loss) [Member]
Accumulated Deficit [Member]
Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2020 $ 31,484 $ 11 $ 370,210 $ (43) $ (338,528) $ (166)
Begining balance, Shares at Dec. 31, 2020   11,018,954        
Issuance of common stock upon release of restricted stock units, shares   4,177        
Issuance of common stock from at-the-market offerings, net of offering costs 9,621 $ 2 9,619      
Issuance of common stock from at the market offerings, net of offering costs, shares   1,988,254        
Issuance of common stock from committed purchase agreement, net of offering costs 15,236 $ 3 15,233      
Issuance of common stock from committed purchase agreement, net of offering costs, shares   3,000,000        
Stock-based compensation 360   360      
Net unrealized loss on investments, net of tax (14)     (14)    
Net loss (7,155)       (7,151) (4)
Ending balance at Mar. 31, 2021 49,532 $ 16 395,422 (57) (345,679) (170)
Ending balance, Shares at Mar. 31, 2021   16,011,385        
Beginning balance at Dec. 31, 2020 31,484 $ 11 370,210 (43) (338,528) (166)
Begining balance, Shares at Dec. 31, 2020   11,018,954        
Net unrealized loss on investments, net of tax (18)          
Net loss (17,547)          
Ending balance at Jun. 30, 2021 40,805 $ 16 397,091 (61) (356,070) (171)
Ending balance, Shares at Jun. 30, 2021   16,307,370        
Beginning balance at Mar. 31, 2021 49,532 $ 16 395,422 (57) (345,679) (170)
Begining balance, Shares at Mar. 31, 2021   16,011,385        
Issuance of common stock upon exercise of stock options 1   1      
Issuance of common stock upon exercise of stock options, shares   553        
Issuance of common stock pursuant to employee stock purchase plan 5   5      
Issuance of common stock pursuant to employee stock purchase plan, shares   1,602        
Issuance of common stock from at-the-market offerings, net of offering costs 1,265   1,265      
Issuance of common stock from at the market offerings, net of offering costs, shares   293,830        
Stock-based compensation 398   398      
Net unrealized loss on investments, net of tax (4)     (4)    
Net loss (10,392)       (10,391) (1)
Ending balance at Jun. 30, 2021 40,805 $ 16 397,091 (61) (356,070) (171)
Ending balance, Shares at Jun. 30, 2021   16,307,370        
Beginning balance at Dec. 31, 2021 109,126 $ 28 481,832 (263) (372,296) (175)
Begining balance, Shares at Dec. 31, 2021   27,793,035        
Issuance of common stock upon release of restricted stock units, shares   2,500        
Issuance of common stock upon exercise of stock options 1   1      
Issuance of common stock upon exercise of stock options, shares   259        
Issuance of common stock from at-the-market offerings, net of offering costs 1,480   1,480      
Issuance of common stock from at the market offerings, net of offering costs, shares   260,455        
Stock-based compensation 417   417      
Net unrealized loss on investments, net of tax (496)     (496)    
Net loss (12,154)       (12,153) (1)
Ending balance at Mar. 31, 2022 98,374 $ 28 483,730 (759) (384,449) (176)
Ending balance, Shares at Mar. 31, 2022   28,056,249        
Beginning balance at Dec. 31, 2021 $ 109,126 $ 28 481,832 (263) (372,296) (175)
Begining balance, Shares at Dec. 31, 2021   27,793,035        
Issuance of common stock upon exercise of stock options, shares 259          
Net unrealized loss on investments, net of tax $ (547)          
Net loss (24,575)          
Ending balance at Jun. 30, 2022 86,458 $ 28 484,286 (810) (396,869) (177)
Ending balance, Shares at Jun. 30, 2022   28,127,458        
Beginning balance at Mar. 31, 2022 98,374 $ 28 483,730 (759) (384,449) (176)
Begining balance, Shares at Mar. 31, 2022   28,056,249        
Issuance of common stock pursuant to employee stock purchase plan 5   5      
Issuance of common stock pursuant to employee stock purchase plan, shares   1,958        
Issuance of common stock from at-the-market offerings, net of offering costs 34   34      
Issuance of common stock from at the market offerings, net of offering costs, shares   69,251        
Stock-based compensation 517   517      
Net unrealized loss on investments, net of tax (51)     (51)    
Net loss (12,421)       (12,420) (1)
Ending balance at Jun. 30, 2022 $ 86,458 $ 28 $ 484,286 $ (810) $ (396,869) $ (177)
Ending balance, Shares at Jun. 30, 2022   28,127,458