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Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2018 | $ 131,539 | $ 23 | $ 281,891 | $ (47) | $ (150,328)
Common Stock Balance, Shares at Dec. 31, 2018 |  | 22,848,184 |  |  |
Adoption of Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606) | 10,327 |  |  |  | 10,327
Exercise of common stock options | 42 |  | 42 |  |
Exercise of common stock options, Shares |  | 8,347 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 671 |  | 671 |  |
Issuance of common stock under Employee Stock Purchase Plan, Shares |  | 68,910 |  |  |
Stock-based compensation expense | 2,286 |  | 2,286 |  |
Net unrealized gain (loss) on available-for- sale securities | 103 |  |  | 103 |
Net income (loss) | (14,250) |  |  |  | (14,250)
Balances at Mar. 31, 2019 | 130,718 | $ 23 | 284,890 | 56 | (154,251)
Common Stock Balance, Shares at Mar. 31, 2019 |  | 22,925,441 |  |  |
Balances at Dec. 31, 2018 | 131,539 | $ 23 | 281,891 | (47) | (150,328)
Common Stock Balance, Shares at Dec. 31, 2018 |  | 22,848,184 |  |  |
Net unrealized gain (loss) on available-for- sale securities | 260 |  |  |  |
Net income (loss) | (28,043) |  |  |  |
Balances at Jun. 30, 2019 | 119,555 | $ 23 | 287,363 | 213 | (168,044)
Common Stock Balance, Shares at Jun. 30, 2019 |  | 22,927,203 |  |  |
Balances at Dec. 31, 2018 | $ 131,539 | $ 23 | 281,891 | (47) | (150,328)
Common Stock Balance, Shares at Dec. 31, 2018 |  | 22,848,184 |  |  |
Exercise of common stock options, Shares | 191,165 |  |  |  |
Balances at Dec. 31, 2019 | $ 97,789 | $ 23 | 293,346 | 165 | (195,745)
Common Stock Balance, Shares at Dec. 31, 2019 |  | 23,098,969 |  |  |
Balances at Mar. 31, 2019 | 130,718 | $ 23 | 284,890 | 56 | (154,251)
Common Stock Balance, Shares at Mar. 31, 2019 |  | 22,925,441 |  |  |
Exercise of common stock options | 10 |  | 10 |  |
Exercise of common stock options, Shares |  | 1,762 |  |  |
Stock-based compensation expense | 2,463 |  | 2,463 |  |
Net unrealized gain (loss) on available-for- sale securities | 157 |  |  | 157 |
Net income (loss) | (13,793) |  |  |  | (13,793)
Balances at Jun. 30, 2019 | 119,555 | $ 23 | 287,363 | 213 | (168,044)
Common Stock Balance, Shares at Jun. 30, 2019 |  | 22,927,203 |  |  |
Balances at Dec. 31, 2019 | 97,789 | $ 23 | 293,346 | 165 | (195,745)
Common Stock Balance, Shares at Dec. 31, 2019 |  | 23,098,969 |  |  |
Exercise of common stock options | 56 |  | 56 |  |
Exercise of common stock options, Shares |  | 12,937 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 646 |  | 646 |  |
Issuance of common stock under Employee Stock Purchase Plan, Shares |  | 74,465 |  |  |
Vesting of restricted stock units |  | 41,050 |  |  |
Stock-based compensation expense | 2,707 |  | 2,707 |  |
Issuance of common stock warrants in connection with debt refinancing | 619 |  | 619 |  |
Net unrealized gain (loss) on available-for- sale securities | (137) |  |  | (137) |
Net income (loss) | (19,595) |  |  |  | (19,595)
Balances at Mar. 31, 2020 | 82,085 | $ 23 | 297,374 | 28 | (215,340)
Common Stock Balance, Shares at Mar. 31, 2020 |  | 23,227,421 |  |  |
Balances at Dec. 31, 2019 | $ 97,789 | $ 23 | 293,346 | 165 | (195,745)
Common Stock Balance, Shares at Dec. 31, 2019 |  | 23,098,969 |  |  |
Exercise of common stock options, Shares | 191,165 |  |  |  |
Net unrealized gain (loss) on available-for- sale securities | $ 233 |  |  |  |
Net income (loss) | 10,277 |  |  |  |
Balances at Jun. 30, 2020 | 206,757 | $ 36 | 391,791 | 398 | (185,468)
Common Stock Balance, Shares at Jun. 30, 2020 |  | 35,878,928 |  |  |
Balances at Mar. 31, 2020 | 82,085 | $ 23 | 297,374 | 28 | (215,340)
Common Stock Balance, Shares at Mar. 31, 2020 |  | 23,227,421 |  |  |
Exercise of common stock options | 8 |  | 8 |  |
Exercise of common stock options, Shares |  | 1,257 |  |  |
Vesting of restricted stock units |  | 250 |  |  |
Stock-based compensation expense | 3,011 |  | 3,011 |  |
Issuance of common stock in connection with public offering, net of issuance costs | 91,411 | $ 13 | 91,398 |  |
Issuance of common stock in connection with public offering, net of issuance costs, Shares |  | 12,650,000 |  |  |
Net unrealized gain (loss) on available-for- sale securities | 370 |  |  | 370 |
Net income (loss) | 29,872 |  |  |  | 29,872
Balances at Jun. 30, 2020 | $ 206,757 | $ 36 | $ 391,791 | $ 398 | $ (185,468)
Common Stock Balance, Shares at Jun. 30, 2020 |  | 35,878,928 |  |  |

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