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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

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