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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Accumulated Deficit
Other Comprehensive Income (Loss)
BALANCE at beginning of period (in shares) at Dec. 31, 2019   15,714,000        
BALANCE at beginning of period at Dec. 31, 2019 $ 137,579 $ 161 $ (5,017) $ 396,102 $ (253,642) $ (25)
Stock issued upon option exercise and vesting of restricted stock units (in shares)   29,000        
Stock issued upon option exercise and vesting of restricted stock units 106     106    
Share based compensation 438     438    
Net loss (1,767)       (1,767)  
Other comprehensive loss 65         65
BALANCE at end of period (in shares) at Mar. 31, 2020   15,743,000        
BALANCE at end of period at Mar. 31, 2020 136,421 $ 161 (5,017) 396,646 (255,409) 40
BALANCE at beginning of period (in shares) at Dec. 31, 2019   15,714,000        
BALANCE at beginning of period at Dec. 31, 2019 137,579 $ 161 (5,017) 396,102 (253,642) (25)
Net loss (10,470)          
BALANCE at end of period (in shares) at Sep. 30, 2020   15,900,000        
BALANCE at end of period at Sep. 30, 2020 130,096 $ 163 (5,017) 398,449 (264,112) 613
BALANCE at beginning of period (in shares) at Mar. 31, 2020   15,743,000        
BALANCE at beginning of period at Mar. 31, 2020 136,421 $ 161 (5,017) 396,646 (255,409) 40
Stock issued upon option exercise and vesting of restricted stock units (in shares)   66,000        
Stock issued upon option exercise and vesting of restricted stock units 302 $ 1   301    
Stock issued, ESPP (in shares)   32,000        
Stock issued, ESPP 157     157    
Share based compensation 588     588    
Net loss (3,944)       (3,944)  
Other comprehensive loss 562         562
BALANCE at end of period (in shares) at Jun. 30, 2020   15,841,000        
BALANCE at end of period at Jun. 30, 2020 $ 134,086 $ 162 (5,017) 397,692 (259,353) 602
Stock issued upon option exercise and vesting of restricted stock units (in shares) 58,000 59,000        
Stock issued upon option exercise and vesting of restricted stock units $ 51 $ 1   50    
Share based compensation 707     707    
Net loss (4,759)       (4,759)  
Other comprehensive loss 11         11
BALANCE at end of period (in shares) at Sep. 30, 2020   15,900,000        
BALANCE at end of period at Sep. 30, 2020 130,096 $ 163 (5,017) 398,449 (264,112) 613
BALANCE at beginning of period (in shares) at Dec. 31, 2020   18,970,000        
BALANCE at beginning of period at Dec. 31, 2020 145,654 $ 193 (5,017) 419,827 (269,953) 604
Stock issued upon option exercise and vesting of restricted stock units (in shares)   51,000        
Stock issued upon option exercise and vesting of restricted stock units 132 $ 1   131    
Share based compensation 626     626    
Share issuance costs (23)     (23)    
Net loss (1,598)       (1,598)  
Other comprehensive loss (139)         (139)
BALANCE at end of period (in shares) at Mar. 31, 2021   19,021,000        
BALANCE at end of period at Mar. 31, 2021 144,652 $ 194 (5,017) 420,561 (271,551) 465
BALANCE at beginning of period (in shares) at Dec. 31, 2020   18,970,000        
BALANCE at beginning of period at Dec. 31, 2020 145,654 $ 193 (5,017) 419,827 (269,953) 604
Net loss 7,494          
BALANCE at end of period (in shares) at Sep. 30, 2021   19,968,000        
BALANCE at end of period at Sep. 30, 2021 161,939 $ 204 (5,017) 428,894 (262,459) 317
BALANCE at beginning of period (in shares) at Mar. 31, 2021   19,021,000        
BALANCE at beginning of period at Mar. 31, 2021 144,652 $ 194 (5,017) 420,561 (271,551) 465
Stock issued upon option exercise and vesting of restricted stock units (in shares)   49,000        
Stock issued upon option exercise and vesting of restricted stock units 189 $ 1   188    
Stock issued, ESPP (in shares)   29,000        
Stock issued, ESPP 170     170    
Share based compensation 714     714    
Net loss 3,764       3,764  
Other comprehensive loss (69)         (69)
BALANCE at end of period (in shares) at Jun. 30, 2021   19,099,000        
BALANCE at end of period at Jun. 30, 2021 $ 149,420 $ 195 (5,017) 421,633 (267,787) 396
Stock issued upon option exercise and vesting of restricted stock units (in shares) 9,000 102,000        
Stock issued upon option exercise and vesting of restricted stock units $ 58 $ 1   57    
Stock Issued During Period, Value, New Issues 6,428 $ 8   6,420    
Stock Issued During Period, Shares, New Issues   767,000        
Share based compensation 784     784    
Net loss 5,328       5,328  
Other comprehensive loss (79)         (79)
BALANCE at end of period (in shares) at Sep. 30, 2021   19,968,000        
BALANCE at end of period at Sep. 30, 2021 $ 161,939 $ 204 $ (5,017) $ 428,894 $ (262,459) $ 317