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CONDENSED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive (Loss) Income | Total
--- | --- | --- | --- | --- | ---
Balance, amount at Dec. 31, 2018 | $ 6 | $ 481,357 | $ (365,512) | $ (38) | $ 115,813
Balance, shares at Dec. 31, 2018 | 62,516,627 |  |  |  |
Issuance of common stock under employee stock purchase plan, amount |  | 397 |  |  | 397
Issuance of common stock under employee stock purchase plan, shares | 160,744 |  |  |  |
Issuance of common stock for services, amount |  | 311 |  |  | 311
Issuance of common stock for services, shares | 113,136 |  |  |  |
Issuance of common stock upon exercise of options, amount |  | 21 |  |  | 21
Issuance of common stock upon exercise of options, shares | 6,964 |  |  |  |
Issuance of common stock upon vesting of restricted stock units, shares | 85,609 |  |  |  |
Stock-based compensation |  | 7,724 |  |  | 7,724
Unrealized (losses) gains on available-for-sale securities |  |  |  | 42 | 42
Net loss |  |  | (75,150) |  | (75,150)
Balance, amount at Sep. 30, 2019 | $ 6 | 489,810 | (440,662) | 4 | 49,158
Balance, shares at Sep. 30, 2019 | 62,883,080 |  |  |  |
Balance, amount at Jun. 30, 2019 | $ 6 | 485,718 | (417,123) | 16 | 68,617
Balance, shares at Jun. 30, 2019 | 62,800,869 |  |  |  |
Issuance of common stock under employee stock purchase plan, amount |  | 200 |  |  | 200
Issuance of common stock under employee stock purchase plan, shares | 77,698 |  |  |  |
Issuance of common stock upon exercise of options, amount |  | 13 |  |  | 13
Issuance of common stock upon exercise of options, shares | 4,513 |  |  |  |
Stock-based compensation |  | 3,879 |  |  | 3,879
Unrealized (losses) gains on available-for-sale securities |  |  |  | (12) | (12)
Net loss |  |  | (23,539) |  | (23,539)
Balance, amount at Sep. 30, 2019 | $ 6 | 489,810 | (440,662) | 4 | 49,158
Balance, shares at Sep. 30, 2019 | 62,883,080 |  |  |  |
Balance, amount at Dec. 31, 2019 | $ 9 | 647,078 | (460,452) | 20 | 186,655
Balance, shares at Dec. 31, 2019 | 88,817,741 |  |  |  |
Issuance of common stock under employee stock purchase plan, amount |  | 834 |  |  | 834
Issuance of common stock under employee stock purchase plan, shares | 169,931 |  |  |  |
Issuance of common stock for services, amount |  | 310 |  |  | 310
Issuance of common stock for services, shares | 42,403 |  |  |  |
Issuance of common stock upon exercise of options, amount |  | 759 |  |  | 759
Issuance of common stock upon exercise of options, shares | 346,806 |  |  |  |
Issuance of common stock upon vesting of restricted stock units, shares | 866,528 |  |  |  |
Stock-based compensation |  | 8,149 |  |  | 8,149
Unrealized (losses) gains on available-for-sale securities |  |  |  | 70 | 70
Net loss |  |  | (65,437) |  | (65,437)
Balance, amount at Sep. 30, 2020 | $ 9 | 657,130 | (525,889) | 90 | 131,340
Balance, shares at Sep. 30, 2020 | 90,243,409 |  |  |  |
Balance, amount at Jun. 30, 2020 | $ 9 | 653,805 | (507,781) | 317 | 146,350
Balance, shares at Jun. 30, 2020 | 89,140,563 |  |  |  |
Issuance of common stock under employee stock purchase plan, amount |  | 459 |  |  | 459
Issuance of common stock under employee stock purchase plan, shares | 94,127 |  |  |  |
Issuance of common stock upon exercise of options, amount |  | 339 |  |  | 339
Issuance of common stock upon exercise of options, shares | 142,191 |  |  |  |
Issuance of common stock upon vesting of restricted stock units, shares | 866,528 |  |  |  |
Stock-based compensation |  | 2,527 |  |  | 2,527
Unrealized (losses) gains on available-for-sale securities |  |  |  | (227) | (227)
Net loss |  |  | (18,108) |  | (18,108)
Balance, amount at Sep. 30, 2020 | $ 9 | $ 657,130 | $ (525,889) | $ 90 | $ 131,340
Balance, shares at Sep. 30, 2020 | 90,243,409 |  |  |  |

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