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Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Deficit [Member] Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Accumulated Deficit [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 150 | $ 1,096,053 | $ (36) |  | $ (982,106) |  | $ 114,061
Balance, shares at Dec. 31, 2018 | 150,244 |  |  |  |  |  |
Net loss |  |  |  |  | (84,043) |  | (84,043)
Other comprehensive income (loss) |  |  | 47 |  |  |  | 47
Issuance of common stock in conjunction with equity plans | $ 3 | 8,414 |  |  |  |  | 8,417
Issuance of common stock in conjunction with equity plans, shares | 2,787 |  |  |  |  |  |
Stock-based compensation expense |  | 12,532 |  |  |  |  | 12,532
Balance at Sep. 30, 2019 | $ 153 | 1,116,999 | 11 |  | (1,066,149) |  | 51,014
Balance, shares at Sep. 30, 2019 | 153,031 |  |  |  |  |  |
Balance at Jun. 30, 2019 | $ 153 | 1,112,610 | 17 |  | (1,037,026) |  | 75,754
Balance, shares at Jun. 30, 2019 | 152,959 |  |  |  |  |  |
Net loss |  |  |  |  | (29,123) |  | (29,123)
Other comprehensive income (loss) |  |  | (6) |  |  |  | (6)
Issuance of common stock in conjunction with equity plans |  | 327 |  |  |  |  | 327
Issuance of common stock in conjunction with equity plans, shares | 72 |  |  |  |  |  |
Stock-based compensation expense |  | 4,062 |  |  |  |  | 4,062
Balance at Sep. 30, 2019 | $ 153 | 1,116,999 | 11 |  | (1,066,149) |  | 51,014
Balance, shares at Sep. 30, 2019 | 153,031 |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ 153 | 1,120,999 | 5 | $ (32) | (1,066,240) | $ (32) | $ 54,917
Balance, shares at Dec. 31, 2019 | 153,119 |  |  |  |  |  | 153,119
Net loss |  |  |  |  | (45,532) |  | $ (45,532)
Other comprehensive income (loss) |  |  | 113 |  |  |  | 113
Issuance of common stock in conjunction with equity plans | $ 4 | 14,170 |  |  |  |  | 14,174
Issuance of common stock in conjunction with equity plans, shares | 4,473 |  |  |  |  |  |
Issuance of common stock from Underwritten Public Equity Offering, net of issuance costs | $ 23 | 93,575 |  |  |  |  | 93,598
Issuance of common stock from Underwritten Public Equity Offering, net of issuance costs, shares | 22,345 |  |  |  |  |  |
Stock-based compensation expense |  | 12,258 |  |  |  |  | 12,258
Balance at Sep. 30, 2020 | $ 180 | 1,241,002 | 118 |  | (1,111,804) |  | $ 129,496
Balance, shares at Sep. 30, 2020 | 179,937 |  |  |  |  |  | 179,937
Balance at Jun. 30, 2020 | $ 154 | 1,129,091 | 243 |  | (1,088,096) |  | $ 41,392
Balance, shares at Jun. 30, 2020 | 154,318 |  |  |  |  |  |
Net loss |  |  |  |  | (23,708) |  | (23,708)
Other comprehensive income (loss) |  |  | (125) |  |  |  | (125)
Issuance of common stock in conjunction with equity plans | $ 3 | 13,344 |  |  |  |  | 13,347
Issuance of common stock in conjunction with equity plans, shares | 3,274 |  |  |  |  |  |
Issuance of common stock from Underwritten Public Equity Offering, net of issuance costs | $ 23 | 93,575 |  |  |  |  | 93,598
Issuance of common stock from Underwritten Public Equity Offering, net of issuance costs, shares | 22,345 |  |  |  |  |  |
Stock-based compensation expense |  | 4,992 |  |  |  |  | 4,992
Balance at Sep. 30, 2020 | $ 180 | $ 1,241,002 | $ 118 |  | $ (1,111,804) |  | $ 129,496
Balance, shares at Sep. 30, 2020 | 179,937 |  |  |  |  |  | 179,937

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